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5\left(8\left(-\frac{61}{10}\right)-1\right)=90\left(-\frac{61}{10}\right)+300
Multiply both sides of the equation by 30, the least common multiple of 6,10.
5\left(\frac{8\left(-61\right)}{10}-1\right)=90\left(-\frac{61}{10}\right)+300
Express 8\left(-\frac{61}{10}\right) as a single fraction.
5\left(\frac{-488}{10}-1\right)=90\left(-\frac{61}{10}\right)+300
Multiply 8 and -61 to get -488.
5\left(-\frac{244}{5}-1\right)=90\left(-\frac{61}{10}\right)+300
Reduce the fraction \frac{-488}{10} to lowest terms by extracting and canceling out 2.
5\left(-\frac{244}{5}-\frac{5}{5}\right)=90\left(-\frac{61}{10}\right)+300
Convert 1 to fraction \frac{5}{5}.
5\times \frac{-244-5}{5}=90\left(-\frac{61}{10}\right)+300
Since -\frac{244}{5} and \frac{5}{5} have the same denominator, subtract them by subtracting their numerators.
5\left(-\frac{249}{5}\right)=90\left(-\frac{61}{10}\right)+300
Subtract 5 from -244 to get -249.
-249=90\left(-\frac{61}{10}\right)+300
Cancel out 5 and 5.
-249=\frac{90\left(-61\right)}{10}+300
Express 90\left(-\frac{61}{10}\right) as a single fraction.
-249=\frac{-5490}{10}+300
Multiply 90 and -61 to get -5490.
-249=-549+300
Divide -5490 by 10 to get -549.
-249=-249
Add -549 and 300 to get -249.
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Compare -249 and -249.