Solve for b
b=28
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\frac{3}{4}b-3b=-63
Subtract 3b from both sides.
-\frac{9}{4}b=-63
Combine \frac{3}{4}b and -3b to get -\frac{9}{4}b.
b=-63\left(-\frac{4}{9}\right)
Multiply both sides by -\frac{4}{9}, the reciprocal of -\frac{9}{4}.
b=\frac{-63\left(-4\right)}{9}
Express -63\left(-\frac{4}{9}\right) as a single fraction.
b=\frac{252}{9}
Multiply -63 and -4 to get 252.
b=28
Divide 252 by 9 to get 28.
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