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-3 (7+m)=21
We simplify the equation to the form, which is simple to understand
-3(7+m)=21
Reorder the terms in parentheses
+(-21-3m)=21
Remove unnecessary parentheses
-21-3m=+21
We move all terms containing m to the left and all other terms to the right.
-3m=+21+21
We simplify left and right side of the equation.
-3m=+42
We divide both sides of the equation by -3 to get m.
m=-14
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