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-7(m-8)=-21
We simplify the equation to the form, which is simple to understand
-7(m-8)=-21
Reorder the terms in parentheses
+(-7m+56)=-21
Remove unnecessary parentheses
-7m+56=-21
We move all terms containing m to the left and all other terms to the right.
-7m=-21-56
We simplify left and right side of the equation.
-7m=-77
We divide both sides of the equation by -7 to get m.
m=11
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