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4m+2(3m+2)=-21
We move all terms to the left:
4m+2(3m+2)-(-21)=0
We add all the numbers together, and all the variables
4m+2(3m+2)+21=0
We multiply parentheses
4m+6m+4+21=0
We add all the numbers together, and all the variables
10m+25=0
We move all terms containing m to the left, all other terms to the right
10m=-25
m=-25/10
m=-2+1/2
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