4z+8z=84

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Solution for 4z+8z=84 equation: 


Simplifying
4z + 8z = 84

Combine like terms: 4z + 8z = 12z
12z = 84

Solving
12z = 84

Solving for variable 'z'.

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

Divide each side by '12'.
z = 7

Simplifying
z = 7

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