\({2 \over 5a}-{8 \over 5a}=-{6 \over 5a}\)

\({3 \over x}+{4 \over 2x}={6 \over 2x}+{4 \over 2x}={10 \over 2x}={5 \over x}\)

\({5 \over 3x}-{9 \over 4y}={20y \over 12xy}-{27x \over 12xy}={20y-27x \over 12xy}\)

\(9+{7 \over 5a}={9 \over 1}+{7 \over 5a}={45a \over 5a}+{7 \over 5a}={45a+7 \over 5a}\)

\(9p+{5 \over 6p}={9p \over 1}⋅{6p \over 6p}+{5 \over 6p}={54p^2 \over 6p}+{5 \over 6p}={54p^2+5 \over 6p}\)

\({6x \over y}-{7 \over 9y}={54x \over 9y}-{7 \over 9y}={54x-7 \over 9y}\)

\({2q \over 5p}+{4p \over 9q}={18q^2 \over 45pq}+{20p^2 \over 45pq}={20p^2+18q^2 \over 45pq}\)

\({9x \over x}={9 \over 1}=9\)

\({a \over 7a}={1 \over 7}\)

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

\({15x \over 3x}=5\)

\({12xy \over 16xz}={3y \over 4z}\)

\({21b \over -27ab}=-{7 \over 9a}\)

\({-28pqr \over 4qr}=-7p\)

\({4ab \over b}+{6ac \over c}=4a+6a=10a\)

\({8 \over p}⋅-{5 \over q}=-{40 \over pq}\)

\({a \over 5}⋅{2 \over b}={2a \over 5b}\)

\({8 \over 9}⋅a={8a \over 9}\)

\({6 \over x}:{3 \over y}={6 \over x}⋅{y \over 3}={6y \over 3x}={2y \over x}\)

\(-{7 \over 6}:x=-{7 \over 6}:{x \over 1}=-{7 \over 6}⋅{1 \over x}=-{7 \over 6x}\)