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\frac{6b}{2b\left(3b+5\right)}-\frac{4b}{3b}
Factor the expressions that are not already factored in \frac{6b}{6b^{2}+10b}.
\frac{3}{3b+5}-\frac{4b}{3b}
Cancel out 2b in both numerator and denominator.
\frac{3}{3b+5}-\frac{4}{3}
Cancel out b in both numerator and denominator.
\frac{3\times 3}{3\left(3b+5\right)}-\frac{4\left(3b+5\right)}{3\left(3b+5\right)}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of 3b+5 and 3 is 3\left(3b+5\right). Multiply \frac{3}{3b+5} times \frac{3}{3}. Multiply \frac{4}{3} times \frac{3b+5}{3b+5}.
\frac{3\times 3-4\left(3b+5\right)}{3\left(3b+5\right)}
Since \frac{3\times 3}{3\left(3b+5\right)} and \frac{4\left(3b+5\right)}{3\left(3b+5\right)} have the same denominator, subtract them by subtracting their numerators.
\frac{9-12b-20}{3\left(3b+5\right)}
Do the multiplications in 3\times 3-4\left(3b+5\right).
\frac{-11-12b}{3\left(3b+5\right)}
Combine like terms in 9-12b-20.
\frac{-11-12b}{9b+15}
Expand 3\left(3b+5\right).