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-157=7(3m-7)-9m
We simplify the equation to the form, which is simple to understand
-157=7(3m-7)-9m
Reorder the terms in parentheses
-157=+(+21m-49)-9m
Remove unnecessary parentheses
-157=+21m-49-9m
We move all terms containing m to the left and all other terms to the right.
-21m+9m=-49+157
We simplify left and right side of the equation.
-12m=+108
We divide both sides of the equation by -12 to get m.
m=-9
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