(x^2-4)-(20-2x)=

Solution for (x^2-4)-(20-2x)= equation:

Simplifying
(x2 + -4) + -1(20 + -2x) = 0

Reorder the terms:
(-4 + x2) + -1(20 + -2x) = 0

Remove parenthesis around (-4 + x2)
-4 + x2 + -1(20 + -2x) = 0
-4 + x2 + (20 * -1 + -2x * -1) = 0
-4 + x2 + (-20 + 2x) = 0

Reorder the terms:
-4 + -20 + 2x + x2 = 0

Combine like terms: -4 + -20 = -24
-24 + 2x + x2 = 0

Solving
-24 + 2x + x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(-6 + -1x)(4 + -1x) = 0

Subproblem 1
Set the factor '(-6 + -1x)' equal to zero and attempt to solve:

Simplifying
-6 + -1x = 0

Solving
-6 + -1x = 0

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

Add '6' to each side of the equation.
-6 + 6 + -1x = 0 + 6

Combine like terms: -6 + 6 = 0
0 + -1x = 0 + 6
-1x = 0 + 6

Combine like terms: 0 + 6 = 6
-1x = 6

Divide each side by '-1'.
x = -6

Simplifying
x = -6
Subproblem 2
Set the factor '(4 + -1x)' equal to zero and attempt to solve:

Simplifying
4 + -1x = 0

Solving
4 + -1x = 0

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

Add '-4' to each side of the equation.
4 + -4 + -1x = 0 + -4

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

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

Divide each side by '-1'.
x = 4

Simplifying
x = 4
Solution
x = {-6, 4}