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40.2-x=x
Add 0.2 and 40 to get 40.2.
40.2-x-x=0
Subtract x from both sides.
40.2-2x=0
Combine -x and -x to get -2x.
-2x=-40.2
Subtract 40.2 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-40.2}{-2}
Divide both sides by -2.
x=\frac{-402}{-20}
Expand \frac{-40.2}{-2} by multiplying both numerator and the denominator by 10.
x=\frac{201}{10}
Reduce the fraction \frac{-402}{-20} to lowest terms by extracting and canceling out -2.