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

\({2 \over a}+{5 \over 9a}={18 \over 9a}+{5 \over 9a}={23 \over 9a}\)

\({5 \over 3x}+{7 \over 4y}={20y \over 12xy}+{21x \over 12xy}={20y+21x \over 12xy}\)

\(8-{7 \over 2a}={8 \over 1}-{7 \over 2a}={16a \over 2a}-{7 \over 2a}={16a-7 \over 2a}\)

\(5p+{7 \over 6p}={5p \over 1}⋅{6p \over 6p}+{7 \over 6p}={30p^2 \over 6p}+{7 \over 6p}={30p^2+7 \over 6p}\)

\({5x \over y}-{7 \over 9y}={45x \over 9y}-{7 \over 9y}={45x-7 \over 9y}\)

\({7b \over 3a}+{9a \over 6b}={14b^2 \over 6ab}+{9a^2 \over 6ab}={9a^2+14b^2 \over 6ab}\)

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

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

\({4a \over 6a}=\frac{2}{3}\)

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

\({21pq \over -24pr}=-{7q \over 8r}\)

\({15b \over -27ab}=-{5 \over 9a}\)

\({-25abc \over 5bc}=-5a\)

\({3xy \over y}-{2xz \over z}=3x-2x=x\)

\({7 \over x}⋅{3 \over y}={21 \over xy}\)

\({a \over 3}⋅{4 \over b}={4a \over 3b}\)

\(-{2 \over 5}⋅a=-{2a \over 5}\)

\({8 \over p}:{5 \over q}={8 \over p}⋅{q \over 5}={8q \over 5p}\)

\({3 \over 8}:x={3 \over 8}:{x \over 1}={3 \over 8}⋅{1 \over x}={3 \over 8x}\)

\({p \over 4}+{p+8 \over 9}={9p \over 36}+{4(p+8) \over 36}={9p+4(p+8) \over 36}={13p+32 \over 36}\)

\({9b \over a}⋅{a+7 \over 3}={9b(a+7) \over 3a}={3b(a+7) \over a}={3ab+21b \over a}\)

\({3 \over 2}:{p-6q \over q}={3 \over 2}⋅{q \over p-6q}={3q \over 2(p-6q)}={3q \over 2p-12q}\)

\({2a^2-4a-60 \over 2a}={2a^2 \over 2a}-{4a \over 2a}-{60 \over 2a}=a-2-{30 \over a}\)

\({3x^2-2x-4 \over x^2}={3x^2 \over x^2}-{2x \over x^2}-{4 \over x^2}=3-{2 \over x}-{4 \over x^2}\)