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-3-3m=-4(2m+7)
We move all terms to the left:
-3-3m-(-4(2m+7))=0
We calculate terms in parentheses: -(-4(2m+7)), so:We get rid of parentheses
-4(2m+7)
We multiply parentheses
-8m-28
Back to the equation:
-(-8m-28)
-3m+8m+28-3=0
We add all the numbers together, and all the variables
5m+25=0
We move all terms containing m to the left, all other terms to the right
5m=-25
m=-25/5
m=-5
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