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8=7m-13
We move all terms to the left:
8-(7m-13)=0
We get rid of parentheses
-7m+13+8=0
We add all the numbers together, and all the variables
-7m+21=0
We move all terms containing m to the left, all other terms to the right
-7m=-21
m=-21/-7
m=+3
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