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4(4m-2)=40
We move all terms to the left:
4(4m-2)-(40)=0
We multiply parentheses
16m-8-40=0
We add all the numbers together, and all the variables
16m-48=0
We move all terms containing m to the left, all other terms to the right
16m=48
m=48/16
m=3
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