18+9z=81

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Solution for 18+9z=81 equation: 



18+9z=81

We move all terms to the left:

18+9z-(81)=0

We add all the numbers together, and all the variables

9z-63=0

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

9z=63

z=63/9

z=7

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