-3=12-m

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Solution for -3=12-m equation: 



-3=12-m

We move all terms to the left:

-3-(12-m)=0

We add all the numbers together, and all the variables

-(-1m+12)-3=0

We get rid of parentheses

1m-12-3=0

We add all the numbers together, and all the variables

m-15=0

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

m=15

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