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0.07x + 0.09 (20000-x)-1550=0
We simplify the equation to the form, which is simple to understand
0.07x + 0.09(20000-x)-1550=0
Reorder the terms in parentheses
0.07x+(+1800-0.09x)-1550=0
Remove unnecessary parentheses
+ 0.07x+1800-0.09x-1550=0
We move all terms containing x to the left and all other terms to the right.
+ 0.07x-0.09x=0-1800+1550
We simplify left and right side of the equation.
-0.02x=-250
We divide both sides of the equation by -0.02 to get x.
x=12500
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