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135x\times \frac{90}{100}-500-100x=20800
Multiply both sides of the equation by 100.
135x\times \frac{9}{10}-500-100x=20800
Reduce the fraction \frac{90}{100} to lowest terms by extracting and canceling out 10.
\frac{135\times 9}{10}x-500-100x=20800
Express 135\times \frac{9}{10} as a single fraction.
\frac{1215}{10}x-500-100x=20800
Multiply 135 and 9 to get 1215.
\frac{243}{2}x-500-100x=20800
Reduce the fraction \frac{1215}{10} to lowest terms by extracting and canceling out 5.
\frac{43}{2}x-500=20800
Combine \frac{243}{2}x and -100x to get \frac{43}{2}x.
\frac{43}{2}x=20800+500
Add 500 to both sides.
\frac{43}{2}x=21300
Add 20800 and 500 to get 21300.
x=21300\times \frac{2}{43}
Multiply both sides by \frac{2}{43}, the reciprocal of \frac{43}{2}.
x=\frac{21300\times 2}{43}
Express 21300\times \frac{2}{43} as a single fraction.
x=\frac{42600}{43}
Multiply 21300 and 2 to get 42600.