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-66=-7m+25
We move all terms to the left:
-66-(-7m+25)=0
We get rid of parentheses
7m-25-66=0
We add all the numbers together, and all the variables
7m-91=0
We move all terms containing m to the left, all other terms to the right
7m=91
m=91/7
m=13
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