-2(-2)-2z=-20

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Solution for -2(-2)-2z=-20 equation: 


Simplifying
-2(-2) + -2z = -20

Multiply -2 * -2
4 + -2z = -20

Solving
4 + -2z = -20

Solving for variable 'z'.

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

Add '-4' to each side of the equation.
4 + -4 + -2z = -20 + -4

Combine like terms: 4 + -4 = 0
0 + -2z = -20 + -4
-2z = -20 + -4

Combine like terms: -20 + -4 = -24
-2z = -24

Divide each side by '-2'.
z = 12

Simplifying
z = 12

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