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.04x+.07(13000-x)=780
We simplify the equation to the form, which is simple to understand
.04x+.07(13000-x)=780
Reorder the terms in parentheses
.04x+(+910-0.07x)=780
Remove unnecessary parentheses
+.04x+910-0.07x=+780
We move all terms containing x to the left and all other terms to the right.
+ 0.04x-0.07x=+780-910
We simplify left and right side of the equation.
-0.03x=-130
We divide both sides of the equation by -0.03 to get x.
x=4333.33333333
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