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.04x+.08(20-x)=1.4
We simplify the equation to the form, which is simple to understand
.04x+.08(20-x)=1.4
Reorder the terms in parentheses
.04x+(+1.6-0.08x)=1.4
Remove unnecessary parentheses
+.04x+1.6-0.08x=+1.4
We move all terms containing x to the left and all other terms to the right.
+ 0.04x-0.08x=+1.4-1.6
We simplify left and right side of the equation.
-0.04x=-0.2
We divide both sides of the equation by -0.04 to get x.
x=5
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