Evaluate
\frac{9}{7b^{2}}
Differentiate w.r.t. b
-\frac{18}{7b^{3}}
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\frac{6a\times 3}{7b\times 2ab}
Divide \frac{6a}{7b} by \frac{2ab}{3} by multiplying \frac{6a}{7b} by the reciprocal of \frac{2ab}{3}.
\frac{3\times 3}{7bb}
Cancel out 2a in both numerator and denominator.
\frac{9}{7bb}
Multiply 3 and 3 to get 9.
\frac{9}{7b^{2}}
Multiply b and b to get b^{2}.
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