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2(m+4)=45
We move all terms to the left:
2(m+4)-(45)=0
We multiply parentheses
2m+8-45=0
We add all the numbers together, and all the variables
2m-37=0
We move all terms containing m to the left, all other terms to the right
2m=37
m=37/2
m=18+1/2
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