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.05x+.10(140-x)=11.15
We simplify the equation to the form, which is simple to understand
.05x+.10(140-x)=11.15
Reorder the terms in parentheses
.05x+(+14-0.1x)=11.15
Remove unnecessary parentheses
+.05x+14-0.1x=+11.15
We move all terms containing x to the left and all other terms to the right.
+ 0.05x-0.1x=+11.15-14
We simplify left and right side of the equation.
-0.05x=-2.85
We divide both sides of the equation by -0.05 to get x.
x=57
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