(3x+6)(x-3)=0

Solution for (3x+6)(x-3)=0 equation:

Simplifying
(3x + 6)(x + -3) = 0

Reorder the terms:
(6 + 3x)(x + -3) = 0

Reorder the terms:
(6 + 3x)(-3 + x) = 0

Multiply (6 + 3x) * (-3 + x)
(6(-3 + x) + 3x * (-3 + x)) = 0
((-3 * 6 + x * 6) + 3x * (-3 + x)) = 0
((-18 + 6x) + 3x * (-3 + x)) = 0
(-18 + 6x + (-3 * 3x + x * 3x)) = 0
(-18 + 6x + (-9x + 3x2)) = 0

Combine like terms: 6x + -9x = -3x
(-18 + -3x + 3x2) = 0

Solving
-18 + -3x + 3x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '3'.
3(-6 + -1x + x2) = 0

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

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

Simplifying
-2 + -1x = 0

Solving
-2 + -1x = 0

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

Add '2' to each side of the equation.
-2 + 2 + -1x = 0 + 2

Combine like terms: -2 + 2 = 0
0 + -1x = 0 + 2
-1x = 0 + 2

Combine like terms: 0 + 2 = 2
-1x = 2

Divide each side by '-1'.
x = -2

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

Simplifying
3 + -1x = 0

Solving
3 + -1x = 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 + -1x = 0 + -3

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

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

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

Simplifying
x = 3
Solution
x = {-2, 3}