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\left(1-\frac{10}{100}\right)x+\left(1+\frac{5}{100}\right)\left(100-x\right)=800x
Multiply both sides of the equation by 8.
\left(1-\frac{1}{10}\right)x+\left(1+\frac{5}{100}\right)\left(100-x\right)=800x
Reduce the fraction \frac{10}{100} to lowest terms by extracting and canceling out 10.
\left(\frac{10}{10}-\frac{1}{10}\right)x+\left(1+\frac{5}{100}\right)\left(100-x\right)=800x
Convert 1 to fraction \frac{10}{10}.
\frac{10-1}{10}x+\left(1+\frac{5}{100}\right)\left(100-x\right)=800x
Since \frac{10}{10} and \frac{1}{10} have the same denominator, subtract them by subtracting their numerators.
\frac{9}{10}x+\left(1+\frac{5}{100}\right)\left(100-x\right)=800x
Subtract 1 from 10 to get 9.
\frac{9}{10}x+\left(1+\frac{1}{20}\right)\left(100-x\right)=800x
Reduce the fraction \frac{5}{100} to lowest terms by extracting and canceling out 5.
\frac{9}{10}x+\left(\frac{20}{20}+\frac{1}{20}\right)\left(100-x\right)=800x
Convert 1 to fraction \frac{20}{20}.
\frac{9}{10}x+\frac{20+1}{20}\left(100-x\right)=800x
Since \frac{20}{20} and \frac{1}{20} have the same denominator, add them by adding their numerators.
\frac{9}{10}x+\frac{21}{20}\left(100-x\right)=800x
Add 20 and 1 to get 21.
\frac{9}{10}x+\frac{21}{20}\times 100+\frac{21}{20}\left(-1\right)x=800x
Use the distributive property to multiply \frac{21}{20} by 100-x.
\frac{9}{10}x+\frac{21\times 100}{20}+\frac{21}{20}\left(-1\right)x=800x
Express \frac{21}{20}\times 100 as a single fraction.
\frac{9}{10}x+\frac{2100}{20}+\frac{21}{20}\left(-1\right)x=800x
Multiply 21 and 100 to get 2100.
\frac{9}{10}x+105+\frac{21}{20}\left(-1\right)x=800x
Divide 2100 by 20 to get 105.
\frac{9}{10}x+105-\frac{21}{20}x=800x
Multiply \frac{21}{20} and -1 to get -\frac{21}{20}.
-\frac{3}{20}x+105=800x
Combine \frac{9}{10}x and -\frac{21}{20}x to get -\frac{3}{20}x.
-\frac{3}{20}x+105-800x=0
Subtract 800x from both sides.
-\frac{16003}{20}x+105=0
Combine -\frac{3}{20}x and -800x to get -\frac{16003}{20}x.
-\frac{16003}{20}x=-105
Subtract 105 from both sides. Anything subtracted from zero gives its negation.
x=-105\left(-\frac{20}{16003}\right)
Multiply both sides by -\frac{20}{16003}, the reciprocal of -\frac{16003}{20}.
x=\frac{-105\left(-20\right)}{16003}
Express -105\left(-\frac{20}{16003}\right) as a single fraction.
x=\frac{2100}{16003}
Multiply -105 and -20 to get 2100.