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0.02x + 0.09(40000-x)=2130
We simplify the equation to the form, which is simple to understand
0.02x + 0.09(40000-x)=2130
Reorder the terms in parentheses
0.02x+(+3600-0.09x)=2130
Remove unnecessary parentheses
+ 0.02x+3600-0.09x=+2130
We move all terms containing x to the left and all other terms to the right.
+ 0.02x-0.09x=+2130-3600
We simplify left and right side of the equation.
-0.07x=-1470
We divide both sides of the equation by -0.07 to get x.
x=21000
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