31=z+12

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Solution for 31=z+12 equation: 



31=z+12

We move all terms to the left:

31-(z+12)=0

We get rid of parentheses

-z-12+31=0

We add all the numbers together, and all the variables

-1z+19=0

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

-z=-19

z=-19/-1

z=+19

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