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.04x+.07(12000-x)=720
We simplify the equation to the form, which is simple to understand
.04x+.07(12000-x)=720
Reorder the terms in parentheses
.04x+(+840-0.07x)=720
Remove unnecessary parentheses
+.04x+840-0.07x=+720
We move all terms containing x to the left and all other terms to the right.
+ 0.04x-0.07x=+720-840
We simplify left and right side of the equation.
-0.03x=-120
We divide both sides of the equation by -0.03 to get x.
x=4000
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