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-7m+21=-4(3m-3)-1
We move all terms to the left:
-7m+21-(-4(3m-3)-1)=0
We calculate terms in parentheses: -(-4(3m-3)-1), so:We get rid of parentheses
-4(3m-3)-1
We multiply parentheses
-12m+12-1
We add all the numbers together, and all the variables
-12m+11
Back to the equation:
-(-12m+11)
-7m+12m-11+21=0
We add all the numbers together, and all the variables
5m+10=0
We move all terms containing m to the left, all other terms to the right
5m=-10
m=-10/5
m=-2
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