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m+3m+2(m-3)=12
We simplify the equation to the form, which is simple to understand
m+3m+2(m-3)=12
Reorder the terms in parentheses
m+3m+(+2m-6)=12
Remove unnecessary parentheses
+m+3m+2m-6=+12
We move all terms containing m to the left and all other terms to the right.
+1m+3m+2m=+12+6
We simplify left and right side of the equation.
+6m=+18
We divide both sides of the equation by 6 to get m.
m=3
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