\({8 \over 9x}+{5 \over 9x}={13 \over 9x}\)

\({9 \over a}-{5 \over 2a}={18 \over 2a}-{5 \over 2a}={13 \over 2a}\)

\({9 \over 5a}+{7 \over 2b}={18b \over 10ab}+{35a \over 10ab}={18b+35a \over 10ab}\)

\(5+{7 \over 6x}={5 \over 1}+{7 \over 6x}={30x \over 6x}+{7 \over 6x}={30x+7 \over 6x}\)

\({4p \over q}-{3 \over 2q}={8p \over 2q}-{3 \over 2q}={8p-3 \over 2q}\)

\({5x \over x}={5 \over 1}=5\)

\({a \over 2a}={1 \over 2}\)

\({10p \over -16p}=-\frac{5}{8}\)

\({6x \over -3x}=-2\)

\({-8ab \over -28ac}={2b \over 7c}\)

\({-15y \over 40xy}=-{3 \over 8x}\)

\({-15pqr \over -3qr}=5p\)

\({7ab \over b}-{4ac \over c}=7a-4a=3a\)