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9m-m-4=2(m+10)
We move all terms to the left:
9m-m-4-(2(m+10))=0
We add all the numbers together, and all the variables
8m-(2(m+10))-4=0
We calculate terms in parentheses: -(2(m+10)), so:We get rid of parentheses
2(m+10)
We multiply parentheses
2m+20
Back to the equation:
-(2m+20)
8m-2m-20-4=0
We add all the numbers together, and all the variables
6m-24=0
We move all terms containing m to the left, all other terms to the right
6m=24
m=24/6
m=4
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