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0.04x + 0.07(11,000-x)=660
We simplify the equation to the form, which is simple to understand
0.04x + 0.07(11,000-x)=660
Reorder the terms in parentheses
0.04x+( + 0.77-0.07x)=660
Remove unnecessary parentheses
+ 0.04x + 0.77-0.07x=+660
We move all terms containing x to the left and all other terms to the right.
+ 0.04x-0.07x=+660-0.77
We simplify left and right side of the equation.
-0.03x=+659.23
We divide both sides of the equation by -0.03 to get x.
x=-21974.3333333
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