x=(x+0.2)(2x+0.1)

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Solution for x=(x+0.2)(2x+0.1) equation:


Simplifying
x = (x + 0.2)(2x + 0.1)

Reorder the terms:
x = (0.2 + x)(2x + 0.1)

Reorder the terms:
x = (0.2 + x)(0.1 + 2x)

Multiply (0.2 + x) * (0.1 + 2x)
x = (0.2(0.1 + 2x) + x(0.1 + 2x))
x = ((0.1 * 0.2 + 2x * 0.2) + x(0.1 + 2x))
x = ((0.02 + 0.4x) + x(0.1 + 2x))
x = (0.02 + 0.4x + (0.1 * x + 2x * x))
x = (0.02 + 0.4x + (0.1x + 2x2))

Combine like terms: 0.4x + 0.1x = 0.5x
x = (0.02 + 0.5x + 2x2)

Solving
x = 0.02 + 0.5x + 2x2

Solving for variable 'x'.

Reorder the terms:
-0.02 + x + -0.5x + -2x2 = 0.02 + 0.5x + 2x2 + -0.02 + -0.5x + -2x2

Combine like terms: x + -0.5x = 0.5x
-0.02 + 0.5x + -2x2 = 0.02 + 0.5x + 2x2 + -0.02 + -0.5x + -2x2

Reorder the terms:
-0.02 + 0.5x + -2x2 = 0.02 + -0.02 + 0.5x + -0.5x + 2x2 + -2x2

Combine like terms: 0.02 + -0.02 = 0.00
-0.02 + 0.5x + -2x2 = 0.00 + 0.5x + -0.5x + 2x2 + -2x2
-0.02 + 0.5x + -2x2 = 0.5x + -0.5x + 2x2 + -2x2

Combine like terms: 0.5x + -0.5x = 0.0
-0.02 + 0.5x + -2x2 = 0.0 + 2x2 + -2x2
-0.02 + 0.5x + -2x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
-0.02 + 0.5x + -2x2 = 0

Begin completing the square.  Divide all terms by
-2 the coefficient of the squared term: 

Divide each side by '-2'.
0.01 + -0.25x + x2 = 0

Move the constant term to the right:

Add '-0.01' to each side of the equation.
0.01 + -0.25x + -0.01 + x2 = 0 + -0.01

Reorder the terms:
0.01 + -0.01 + -0.25x + x2 = 0 + -0.01

Combine like terms: 0.01 + -0.01 = 0.00
0.00 + -0.25x + x2 = 0 + -0.01
-0.25x + x2 = 0 + -0.01

Combine like terms: 0 + -0.01 = -0.01
-0.25x + x2 = -0.01

The x term is -0.25x.  Take half its coefficient (-0.125).
Square it (0.015625) and add it to both sides.

Add '0.015625' to each side of the equation.
-0.25x + 0.015625 + x2 = -0.01 + 0.015625

Reorder the terms:
0.015625 + -0.25x + x2 = -0.01 + 0.015625

Combine like terms: -0.01 + 0.015625 = 0.005625
0.015625 + -0.25x + x2 = 0.005625

Factor a perfect square on the left side:
(x + -0.125)(x + -0.125) = 0.005625

Calculate the square root of the right side: 0.075

Break this problem into two subproblems by setting 
(x + -0.125) equal to 0.075 and -0.075.

Subproblem 1

x + -0.125 = 0.075 Simplifying x + -0.125 = 0.075 Reorder the terms: -0.125 + x = 0.075 Solving -0.125 + x = 0.075 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.125' to each side of the equation. -0.125 + 0.125 + x = 0.075 + 0.125 Combine like terms: -0.125 + 0.125 = 0.000 0.000 + x = 0.075 + 0.125 x = 0.075 + 0.125 Combine like terms: 0.075 + 0.125 = 0.2 x = 0.2 Simplifying x = 0.2

Subproblem 2

x + -0.125 = -0.075 Simplifying x + -0.125 = -0.075 Reorder the terms: -0.125 + x = -0.075 Solving -0.125 + x = -0.075 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.125' to each side of the equation. -0.125 + 0.125 + x = -0.075 + 0.125 Combine like terms: -0.125 + 0.125 = 0.000 0.000 + x = -0.075 + 0.125 x = -0.075 + 0.125 Combine like terms: -0.075 + 0.125 = 0.05 x = 0.05 Simplifying x = 0.05

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.2, 0.05}

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