7m-8=-21

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Solution for 7m-8=-21 equation: 



7m-8=-21

We move all terms to the left:

7m-8-(-21)=0

We add all the numbers together, and all the variables

7m+13=0

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

7m=-13

m=-13/7

m=-1+6/7

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