15+3=21+1m

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Solution for 15+3=21+1m equation: 



15+3=21+1m

We move all terms to the left:

15+3-(21+1m)=0

We add all the numbers together, and all the variables

-(m+21)+15+3=0

We add all the numbers together, and all the variables

-(m+21)+18=0

We get rid of parentheses

-m-21+18=0

We add all the numbers together, and all the variables

-1m-3=0

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

-m=3

m=3/-1

m=-3

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