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0.07x + 0.05(9000-x)=5100
We simplify the equation to the form, which is simple to understand
0.07x + 0.05(9000-x)=5100
Reorder the terms in parentheses
0.07x+(+450-0.05x)=5100
Remove unnecessary parentheses
+ 0.07x+450-0.05x=+5100
We move all terms containing x to the left and all other terms to the right.
+ 0.07x-0.05x=+5100-450
We simplify left and right side of the equation.
+ 0.02x=+4650
We divide both sides of the equation by 0.02 to get x.
x=232500
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