31=m+18

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Solution for 31=m+18 equation: 



31=m+18

We move all terms to the left:

31-(m+18)=0

We get rid of parentheses

-m-18+31=0

We add all the numbers together, and all the variables

-1m+13=0

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

-m=-13

m=-13/-1

m=+13

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