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0.135x + 0.09(20000-x)=2520
We simplify the equation to the form, which is simple to understand
0.135x + 0.09(20000-x)=2520
Reorder the terms in parentheses
0.135x+(+1800-0.09x)=2520
Remove unnecessary parentheses
+ 0.135x+1800-0.09x=+2520
We move all terms containing x to the left and all other terms to the right.
+ 0.135x-0.09x=+2520-1800
We simplify left and right side of the equation.
+ 0.045x=+720
We divide both sides of the equation by 0.045 to get x.
x=16000
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