3x(-2x+7)=3

Solution for 3x(-2x+7)=3 equation:

Simplifying
3x(-2x + 7) = 3

Reorder the terms:
3x(7 + -2x) = 3
(7 * 3x + -2x * 3x) = 3
(21x + -6x2) = 3

Solving
21x + -6x2 = 3

Solving for variable 'x'.

Reorder the terms:
-3 + 21x + -6x2 = 3 + -3

Combine like terms: 3 + -3 = 0
-3 + 21x + -6x2 = 0

Factor out the Greatest Common Factor (GCF), '3'.
3(-1 + 7x + -2x2) = 0

Ignore the factor 3.
Subproblem 1
Set the factor '(-1 + 7x + -2x2)' equal to zero and attempt to solve:

Simplifying
-1 + 7x + -2x2 = 0

Solving
-1 + 7x + -2x2 = 0

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

Divide each side by '-2'.
0.5 + -3.5x + x2 = 0

Move the constant term to the right:

Add '-0.5' to each side of the equation.
0.5 + -3.5x + -0.5 + x2 = 0 + -0.5

Reorder the terms:
0.5 + -0.5 + -3.5x + x2 = 0 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + -3.5x + x2 = 0 + -0.5
-3.5x + x2 = 0 + -0.5

Combine like terms: 0 + -0.5 = -0.5
-3.5x + x2 = -0.5

The x term is -3.5x.  Take half its coefficient (-1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
-3.5x + 3.0625 + x2 = -0.5 + 3.0625

Reorder the terms:
3.0625 + -3.5x + x2 = -0.5 + 3.0625

Combine like terms: -0.5 + 3.0625 = 2.5625
3.0625 + -3.5x + x2 = 2.5625

Factor a perfect square on the left side:
(x + -1.75)(x + -1.75) = 2.5625

Calculate the square root of the right side: 1.600781059

Break this problem into two subproblems by setting 
(x + -1.75) equal to 1.600781059 and -1.600781059.

Subproblem 1
x + -1.75 = 1.600781059

Simplifying
x + -1.75 = 1.600781059

Reorder the terms:
-1.75 + x = 1.600781059

Solving
-1.75 + x = 1.600781059

Solving for variable 'x'.

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

Add '1.75' to each side of the equation.
-1.75 + 1.75 + x = 1.600781059 + 1.75

Combine like terms: -1.75 + 1.75 = 0.00
0.00 + x = 1.600781059 + 1.75
x = 1.600781059 + 1.75

Combine like terms: 1.600781059 + 1.75 = 3.350781059
x = 3.350781059

Simplifying
x = 3.350781059

Subproblem 2
x + -1.75 = -1.600781059

Simplifying
x + -1.75 = -1.600781059

Reorder the terms:
-1.75 + x = -1.600781059

Solving
-1.75 + x = -1.600781059

Solving for variable 'x'.

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

Add '1.75' to each side of the equation.
-1.75 + 1.75 + x = -1.600781059 + 1.75

Combine like terms: -1.75 + 1.75 = 0.00
0.00 + x = -1.600781059 + 1.75
x = -1.600781059 + 1.75

Combine like terms: -1.600781059 + 1.75 = 0.149218941
x = 0.149218941

Simplifying
x = 0.149218941

Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {3.350781059, 0.149218941}
Solution
x = {3.350781059, 0.149218941}