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2(2m+2)+2(4m-5)=30
We move all terms to the left:
2(2m+2)+2(4m-5)-(30)=0
We multiply parentheses
4m+8m+4-10-30=0
We add all the numbers together, and all the variables
12m-36=0
We move all terms containing m to the left, all other terms to the right
12m=36
m=36/12
m=3
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