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-28=7(m+3)
We move all terms to the left:
-28-(7(m+3))=0
We calculate terms in parentheses: -(7(m+3)), so:We get rid of parentheses
7(m+3)
We multiply parentheses
7m+21
Back to the equation:
-(7m+21)
-7m-21-28=0
We add all the numbers together, and all the variables
-7m-49=0
We move all terms containing m to the left, all other terms to the right
-7m=49
m=49/-7
m=-7
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