\({5 \over 9x}-{2 \over 9x}={3 \over 9x}={1 \over 3x}\)

\({4 \over x}+{8 \over 2x}={8 \over 2x}+{8 \over 2x}={16 \over 2x}={8 \over x}\)

\({6 \over 2a}+{3 \over 9b}={54b \over 18ab}+{6a \over 18ab}={54b+6a \over 18ab}={9b+a \over 3ab}\)

\(8-{7 \over 5p}={8 \over 1}-{7 \over 5p}={40p \over 5p}-{7 \over 5p}={40p-7 \over 5p}\)

\(5a+{2 \over 7a}={5a \over 1}⋅{7a \over 7a}+{2 \over 7a}={35a^2 \over 7a}+{2 \over 7a}={35a^2+2 \over 7a}\)

\({2x \over y}+{7 \over 4y}={8x \over 4y}+{7 \over 4y}={8x+7 \over 4y}\)

\({9q \over 4p}+{7p \over 2q}={9q^2 \over 4pq}+{14p^2 \over 4pq}={14p^2+9q^2 \over 4pq}\)

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

\({x \over 4x}={1 \over 4}\)

\({9a \over 12a}=\frac{3}{4}\)

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

\({-15xy \over 18xz}=-{5y \over 6z}\)

\({-8y \over 12xy}=-{2 \over 3x}\)

\({-18pqr \over 2qr}=-9p\)

\({6ab \over b}+{5ac \over c}=6a+5a=11a\)

\({7 \over a}⋅-{2 \over b}=-{14 \over ab}\)

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

\(-{4 \over 5}⋅p=-{4p \over 5}\)

\({9 \over x}:{7 \over y}={9 \over x}⋅{y \over 7}={9y \over 7x}\)

\(-{5 \over 8}:a=-{5 \over 8}:{a \over 1}=-{5 \over 8}⋅{1 \over a}=-{5 \over 8a}\)

\({3x \over 5}+{x+9 \over 2}={6x \over 10}+{5(x+9) \over 10}={6x+5(x+9) \over 10}={11x+45 \over 10}\)