\({7 \over 8x}-{5 \over 8x}={2 \over 8x}={1 \over 4x}\)

\({5 \over x}-{2 \over 3x}={15 \over 3x}-{2 \over 3x}={13 \over 3x}\)

\({2 \over 4p}-{3 \over 5q}={10q \over 20pq}-{12p \over 20pq}={10q-12p \over 20pq}={5q-6p \over 10pq}\)

\(3-{5 \over 2a}={3 \over 1}-{5 \over 2a}={6a \over 2a}-{5 \over 2a}={6a-5 \over 2a}\)

\(2a+{8 \over 5a}={2a \over 1}⋅{5a \over 5a}+{8 \over 5a}={10a^2 \over 5a}+{8 \over 5a}={10a^2+8 \over 5a}\)

\({4x \over y}+{2 \over 6y}={24x \over 6y}+{2 \over 6y}={24x+2 \over 6y}={12x+1 \over 3y}\)

\({8b \over 4a}+{3a \over 9b}={72b^2 \over 36ab}+{12a^2 \over 36ab}={12a^2+72b^2 \over 36ab}={a^2+6b^2 \over 3ab}\)

\({8a \over a}={8 \over 1}=8\)

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

\({15p \over -35p}=-\frac{3}{7}\)

\({10a \over -2a}=-5\)

\({10ab \over 35ac}={2b \over 7c}\)

\({18y \over 21xy}={6 \over 7x}\)

\({-10xyz \over 5yz}=-2x\)

\({4pq \over q}-{7pr \over r}=4p-7p=-3p\)

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

\({x \over 9}⋅-{2 \over y}=-{2x \over 9y}\)

\({7 \over 2}⋅x={7x \over 2}\)

\({7 \over p}:{6 \over q}={7 \over p}⋅{q \over 6}={7q \over 6p}\)

\(-{9 \over 8}:a=-{9 \over 8}:{a \over 1}=-{9 \over 8}⋅{1 \over a}=-{9 \over 8a}\)

\({5x \over 7}+{x-1 \over 3}={15x \over 21}+{7(x-1) \over 21}={15x+7(x-1) \over 21}={22x-7 \over 21}\)

\(-{5 \over 3}:{a-6b \over b}=-{5 \over 3}⋅{b \over a-6b}=-{5b \over 3(a-6b)}=-{5b \over 3a-18b}\)

\({5x+3 \over -8x+2}-6={5x+3 \over -8x+2}+{-6(-8x+2) \over -8x+2}={5x+3-6(-8x+2) \over -8x+2}={5x+3+48x-12 \over -8x+2}={53x-9 \over -8x+2}\)