4z-9z=21

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Solution for 4z-9z=21 equation: 


Simplifying
4z + -9z = 21

Combine like terms: 4z + -9z = -5z
-5z = 21

Solving
-5z = 21

Solving for variable 'z'.

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

Divide each side by '-5'.
z = -4.2

Simplifying
z = -4.2

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