12z-(-9z)=

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Solution for 12z-(-9z)= equation: 


Simplifying
12z + -1(-9z) = 0

Remove parenthesis around (-9z)
12z + -1 * -9z = 0

Multiply -1 * -9
12z + 9z = 0

Combine like terms: 12z + 9z = 21z
21z = 0

Solving
21z = 0

Solving for variable 'z'.

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

Divide each side by '21'.
z = 0

Simplifying
z = 0

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