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1800=x-(x*20/100)
We simplify the equation to the form, which is simple to understand
1800=x-(x*20/100)
Remove unnecessary parentheses
1800=x-0.2x
We move all terms containing x to the left and all other terms to the right.
-1x + 0.2x=-1800
We simplify left and right side of the equation.
-0.8x=-1800
We divide both sides of the equation by -0.8 to get x.
x=2250
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