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.05(21-m)+.10(m)=1.65
We simplify the equation to the form, which is simple to understand
.05(21-m)+.10(m)=1.65
Reorder the terms in parentheses
+(+1.05-0.05m)+.10*(m)=1.65
Remove unnecessary parentheses
+1.05-0.05m+.10+*(+m+)=+1.65
Reorder the terms in parentheses
+1.05-0.05m+( + 0.1m)=1.65
Remove unnecessary parentheses
+1.05-0.05m + 0.1m=+1.65
We move all terms containing m to the left and all other terms to the right.
-0.05m + 0.1m=+1.65-1.05
We simplify left and right side of the equation.
+ 0.05m=0.6
We divide both sides of the equation by 0.05 to get m.
m=12
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