Solve for r
r = \frac{9}{2} = 4\frac{1}{2} = 4.5
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\frac{90}{20}=r
Divide both sides by 20.
\frac{9}{2}=r
Reduce the fraction \frac{90}{20} to lowest terms by extracting and canceling out 10.
r=\frac{9}{2}
Swap sides so that all variable terms are on the left hand side.
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