9z=12-21

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Solution for 9z=12-21 equation: 


Simplifying
9z = 12 + -21

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

Solving
9z = -9

Solving for variable 'z'.

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

Divide each side by '9'.
z = -1

Simplifying
z = -1

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