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20.5+0.275x=x
Add 18 and 2.5 to get 20.5.
20.5+0.275x-x=0
Subtract x from both sides.
20.5-0.725x=0
Combine 0.275x and -x to get -0.725x.
-0.725x=-20.5
Subtract 20.5 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-20.5}{-0.725}
Divide both sides by -0.725.
x=\frac{-20500}{-725}
Expand \frac{-20.5}{-0.725} by multiplying both numerator and the denominator by 1000.
x=\frac{820}{29}
Reduce the fraction \frac{-20500}{-725} to lowest terms by extracting and canceling out -25.