3z=12-21

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Solution for 3z=12-21 equation: 


Simplifying
3z = 12 + -21

Combine like terms: 12 + -21 = -9
3z = -9

Solving
3z = -9

Solving for variable 'z'.

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

Divide each side by '3'.
z = -3

Simplifying
z = -3

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