15z+6z=84

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Solution for 15z+6z=84 equation: 



15z+6z=84

We move all terms to the left:

15z+6z-(84)=0

We add all the numbers together, and all the variables

21z-84=0

We move all terms containing z to the left, all other terms to the right

21z=84

z=84/21

z=4

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