81=4.5z+12

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Solution for 81=4.5z+12 equation: 



81=4.5z+12

We move all terms to the left:

81-(4.5z+12)=0

We get rid of parentheses

-4.5z-12+81=0

We add all the numbers together, and all the variables

-4.5z+69=0

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

-4.5z=-69

z=-69/-4.5

z=15+1/3

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