9z-6z=21

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Solution for 9z-6z=21 equation: 


Simplifying
9z + -6z = 21

Combine like terms: 9z + -6z = 3z
3z = 21

Solving
3z = 21

Solving for variable 'z'.

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

Divide each side by '3'.
z = 7

Simplifying
z = 7

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