Solve for x_9
x_{9}=812.5
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x_{9}\times 0.2+650-x_{9}=0
Subtract x_{9} from both sides.
-0.8x_{9}+650=0
Combine x_{9}\times 0.2 and -x_{9} to get -0.8x_{9}.
-0.8x_{9}=-650
Subtract 650 from both sides. Anything subtracted from zero gives its negation.
x_{9}=\frac{-650}{-0.8}
Divide both sides by -0.8.
x_{9}=\frac{-6500}{-8}
Expand \frac{-650}{-0.8} by multiplying both numerator and the denominator by 10.
x_{9}=\frac{1625}{2}
Reduce the fraction \frac{-6500}{-8} to lowest terms by extracting and canceling out -4.
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