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810+x\left(-0.9\right)=20x
Variable x cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by x.
810+x\left(-0.9\right)-20x=0
Subtract 20x from both sides.
810-20.9x=0
Combine x\left(-0.9\right) and -20x to get -20.9x.
-20.9x=-810
Subtract 810 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-810}{-20.9}
Divide both sides by -20.9.
x=\frac{-8100}{-209}
Expand \frac{-810}{-20.9} by multiplying both numerator and the denominator by 10.
x=\frac{8100}{209}
Fraction \frac{-8100}{-209} can be simplified to \frac{8100}{209} by removing the negative sign from both the numerator and the denominator.