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408=3(13m-7)
We simplify the equation to the form, which is simple to understand
408=3(13m-7)
Reorder the terms in parentheses
408=+(+39m-21)
Remove unnecessary parentheses
+408=+39m-21
We move all terms containing m to the left and all other terms to the right.
-39m=-21-408
We simplify left and right side of the equation.
-39m=-429
We divide both sides of the equation by -039 to get m.
m=11
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