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(4m+7)=45
We move all terms to the left:
(4m+7)-(45)=0
We get rid of parentheses
4m+7-45=0
We add all the numbers together, and all the variables
4m-38=0
We move all terms containing m to the left, all other terms to the right
4m=38
m=38/4
m=9+1/2
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