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21=-3(22-m)+2(m-4)
We simplify the equation to the form, which is simple to understand
21=-3(22-m)+2(m-4)
Reorder the terms in parentheses
21=+(-66+3m)+2*(m-4)
Remove unnecessary parentheses
+21=-66+3m+2+*(+m-4+)
Reorder the terms in parentheses
21=-66+3m+(+2m-8)
Remove unnecessary parentheses
+21=-66+3m+2m-8
We move all terms containing m to the left and all other terms to the right.
-3m-2m=-66-8-21
We simplify left and right side of the equation.
-5m=-95
We divide both sides of the equation by -5 to get m.
m=19
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