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-21(3m+6)=-3(4+2m)
We move all terms to the left:
-21(3m+6)-(-3(4+2m))=0
We add all the numbers together, and all the variables
-21(3m+6)-(-3(2m+4))=0
We multiply parentheses
-63m-(-3(2m+4))-126=0
We calculate terms in parentheses: -(-3(2m+4)), so:We get rid of parentheses
-3(2m+4)
We multiply parentheses
-6m-12
Back to the equation:
-(-6m-12)
-63m+6m+12-126=0
We add all the numbers together, and all the variables
-57m-114=0
We move all terms containing m to the left, all other terms to the right
-57m=114
m=114/-57
m=-2
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