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-91=7(-2m-5)
We move all terms to the left:
-91-(7(-2m-5))=0
We calculate terms in parentheses: -(7(-2m-5)), so:We get rid of parentheses
7(-2m-5)
We multiply parentheses
-14m-35
Back to the equation:
-(-14m-35)
14m+35-91=0
We add all the numbers together, and all the variables
14m-56=0
We move all terms containing m to the left, all other terms to the right
14m=56
m=56/14
m=4
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