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28m-6(3m-5)=40
We move all terms to the left:
28m-6(3m-5)-(40)=0
We multiply parentheses
28m-18m+30-40=0
We add all the numbers together, and all the variables
10m-10=0
We move all terms containing m to the left, all other terms to the right
10m=10
m=10/10
m=1
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