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\frac{3}{4}b-3b=3
Subtract 3b from both sides.
-\frac{9}{4}b=3
Combine \frac{3}{4}b and -3b to get -\frac{9}{4}b.
b=3\left(-\frac{4}{9}\right)
Multiply both sides by -\frac{4}{9}, the reciprocal of -\frac{9}{4}.
b=\frac{3\left(-4\right)}{9}
Express 3\left(-\frac{4}{9}\right) as a single fraction.
b=\frac{-12}{9}
Multiply 3 and -4 to get -12.
b=-\frac{4}{3}
Reduce the fraction \frac{-12}{9} to lowest terms by extracting and canceling out 3.