15+3m=21+1m

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



15+3m=21+1m

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

3m-m-21+15=0

We add all the numbers together, and all the variables

2m-6=0

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

2m=6

m=6/2

m=3

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