3m+18=-21

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Solution for 3m+18=-21 equation: 



3m+18=-21

We move all terms to the left:

3m+18-(-21)=0

We add all the numbers together, and all the variables

3m+39=0

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

3m=-39

m=-39/3

m=-13

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