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4m-2(6m+5)=66
We move all terms to the left:
4m-2(6m+5)-(66)=0
We multiply parentheses
4m-12m-10-66=0
We add all the numbers together, and all the variables
-8m-76=0
We move all terms containing m to the left, all other terms to the right
-8m=76
m=76/-8
m=-9+1/2
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