18=20+m

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Solution for 18=20+m equation: 



18=20+m

We move all terms to the left:

18-(20+m)=0

We add all the numbers together, and all the variables

-(m+20)+18=0

We get rid of parentheses

-m-20+18=0

We add all the numbers together, and all the variables

-1m-2=0

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

-m=2

m=2/-1

m=-2

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