Solve for r
r = \frac{21}{4} = 5\frac{1}{4} = 5.25
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r=-7\left(-\frac{3}{4}\right)
Multiply both sides by -\frac{3}{4}, the reciprocal of -\frac{4}{3}.
r=\frac{-7\left(-3\right)}{4}
Express -7\left(-\frac{3}{4}\right) as a single fraction.
r=\frac{21}{4}
Multiply -7 and -3 to get 21.
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