x^2+3x=(x+3)(x+1)

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Solution for x^2+3x=(x+3)(x+1) equation:


Simplifying
x2 + 3x = (x + 3)(x + 1)

Reorder the terms:
3x + x2 = (x + 3)(x + 1)

Reorder the terms:
3x + x2 = (3 + x)(x + 1)

Reorder the terms:
3x + x2 = (3 + x)(1 + x)

Multiply (3 + x) * (1 + x)
3x + x2 = (3(1 + x) + x(1 + x))
3x + x2 = ((1 * 3 + x * 3) + x(1 + x))
3x + x2 = ((3 + 3x) + x(1 + x))
3x + x2 = (3 + 3x + (1 * x + x * x))
3x + x2 = (3 + 3x + (1x + x2))

Combine like terms: 3x + 1x = 4x
3x + x2 = (3 + 4x + x2)

Add '-1x2' to each side of the equation.
3x + x2 + -1x2 = 3 + 4x + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
3x + 0 = 3 + 4x + x2 + -1x2
3x = 3 + 4x + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
3x = 3 + 4x + 0
3x = 3 + 4x

Solving
3x = 3 + 4x

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-4x' to each side of the equation.
3x + -4x = 3 + 4x + -4x

Combine like terms: 3x + -4x = -1x
-1x = 3 + 4x + -4x

Combine like terms: 4x + -4x = 0
-1x = 3 + 0
-1x = 3

Divide each side by '-1'.
x = -3

Simplifying
x = -3

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