3m-3=21-3m

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Solution for 3m-3=21-3m equation: 



3m-3=21-3m

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

3m+3m-21-3=0

We add all the numbers together, and all the variables

6m-24=0

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

6m=24

m=24/6

m=4

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