-2z-12=30

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Solution for -2z-12=30 equation: 


Simplifying
-2z + -12 = 30

Reorder the terms:
-12 + -2z = 30

Solving
-12 + -2z = 30

Solving for variable 'z'.

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

Add '12' to each side of the equation.
-12 + 12 + -2z = 30 + 12

Combine like terms: -12 + 12 = 0
0 + -2z = 30 + 12
-2z = 30 + 12

Combine like terms: 30 + 12 = 42
-2z = 42

Divide each side by '-2'.
z = -21

Simplifying
z = -21

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