(x+3)-(2x-1)(x+3)=0

Solution for (x+3)-(2x-1)(x+3)=0 equation:

Simplifying
(x + 3) + -1(2x + -1)(x + 3) = 0

Reorder the terms:
(3 + x) + -1(2x + -1)(x + 3) = 0

Remove parenthesis around (3 + x)
3 + x + -1(2x + -1)(x + 3) = 0

Reorder the terms:
3 + x + -1(-1 + 2x)(x + 3) = 0

Reorder the terms:
3 + x + -1(-1 + 2x)(3 + x) = 0

Multiply (-1 + 2x) * (3 + x)
3 + x + -1(-1(3 + x) + 2x * (3 + x)) = 0
3 + x + -1((3 * -1 + x * -1) + 2x * (3 + x)) = 0
3 + x + -1((-3 + -1x) + 2x * (3 + x)) = 0
3 + x + -1(-3 + -1x + (3 * 2x + x * 2x)) = 0
3 + x + -1(-3 + -1x + (6x + 2x2)) = 0

Combine like terms: -1x + 6x = 5x
3 + x + -1(-3 + 5x + 2x2) = 0
3 + x + (-3 * -1 + 5x * -1 + 2x2 * -1) = 0
3 + x + (3 + -5x + -2x2) = 0

Reorder the terms:
3 + 3 + x + -5x + -2x2 = 0

Combine like terms: 3 + 3 = 6
6 + x + -5x + -2x2 = 0

Combine like terms: x + -5x = -4x
6 + -4x + -2x2 = 0

Solving
6 + -4x + -2x2 = 0

Solving for variable 'x'.

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

Factor a trinomial.
2((1 + -1x)(3 + x)) = 0

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

Simplifying
1 + -1x = 0

Solving
1 + -1x = 0

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

Add '-1' to each side of the equation.
1 + -1 + -1x = 0 + -1

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

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

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

Simplifying
x = 1
Subproblem 2
Set the factor '(3 + x)' equal to zero and attempt to solve:

Simplifying
3 + x = 0

Solving
3 + x = 0

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

Add '-3' to each side of the equation.
3 + -3 + x = 0 + -3

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

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

Simplifying
x = -3
Solution
x = {1, -3}