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.04x+.02(600-x)=42
We simplify the equation to the form, which is simple to understand
.04x+.02(600-x)=42
Reorder the terms in parentheses
.04x+(+12-0.02x)=42
Remove unnecessary parentheses
+.04x+12-0.02x=+42
We move all terms containing x to the left and all other terms to the right.
+ 0.04x-0.02x=+42-12
We simplify left and right side of the equation.
+ 0.02x=+30
We divide both sides of the equation by 0.02 to get x.
x=1500
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