12+3z=84

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Solution for 12+3z=84 equation: 



12+3z=84

We move all terms to the left:

12+3z-(84)=0

We add all the numbers together, and all the variables

3z-72=0

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

3z=72

z=72/3

z=24

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