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\left(1-\frac{13}{20}\right)x=140
Reduce the fraction \frac{65}{100} to lowest terms by extracting and canceling out 5.
\left(\frac{20}{20}-\frac{13}{20}\right)x=140
Convert 1 to fraction \frac{20}{20}.
\frac{20-13}{20}x=140
Since \frac{20}{20} and \frac{13}{20} have the same denominator, subtract them by subtracting their numerators.
\frac{7}{20}x=140
Subtract 13 from 20 to get 7.
x=140\times \frac{20}{7}
Multiply both sides by \frac{20}{7}, the reciprocal of \frac{7}{20}.
x=\frac{140\times 20}{7}
Express 140\times \frac{20}{7} as a single fraction.
x=\frac{2800}{7}
Multiply 140 and 20 to get 2800.
x=400
Divide 2800 by 7 to get 400.