90=21+3m

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Solution for 90=21+3m equation: 



90=21+3m

We move all terms to the left:

90-(21+3m)=0

We add all the numbers together, and all the variables

-(3m+21)+90=0

We get rid of parentheses

-3m-21+90=0

We add all the numbers together, and all the variables

-3m+69=0

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

-3m=-69

m=-69/-3

m=+23

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