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.40x+.15(100-x)=25
We simplify the equation to the form, which is simple to understand
.40x+.15(100-x)=25
Reorder the terms in parentheses
.40x+(+15-0.15x)=25
Remove unnecessary parentheses
+.40x+15-0.15x=+25
We move all terms containing x to the left and all other terms to the right.
+ 0.4x-0.15x=+25-15
We simplify left and right side of the equation.
+ 0.25x=+10
We divide both sides of the equation by 0.25 to get x.
x=40
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