\({7 \over 8x}-{4 \over 8x}={3 \over 8x}\)

\({7 \over a}+{4 \over 5a}={35 \over 5a}+{4 \over 5a}={39 \over 5a}\)

\({4 \over 3a}-{7 \over 9b}={12b \over 9ab}-{7a \over 9ab}={12b-7a \over 9ab}\)

\(9-{3 \over 8x}={9 \over 1}-{3 \over 8x}={72x \over 8x}-{3 \over 8x}={72x-3 \over 8x}\)

\(6p+{5 \over 8p}={6p \over 1}⋅{8p \over 8p}+{5 \over 8p}={48p^2 \over 8p}+{5 \over 8p}={48p^2+5 \over 8p}\)

\({3x \over y}-{7 \over 4y}={12x \over 4y}-{7 \over 4y}={12x-7 \over 4y}\)

\({6b \over 9a}+{7a \over 8b}={48b^2 \over 72ab}+{63a^2 \over 72ab}={63a^2+48b^2 \over 72ab}={21a^2+16b^2 \over 24ab}\)

\({6p \over p}={6 \over 1}=6\)

\({x \over 6x}={1 \over 6}\)

\({-28a \over 36a}=-\frac{7}{9}\)

\({-12p \over -3p}=4\)

\({-6xy \over 21xz}=-{2y \over 7z}\)

\({35b \over -45ab}=-{7 \over 9a}\)

\({12abc \over 4bc}=3a\)

\({3xy \over y}+{4xz \over z}=3x+4x=7x\)

\({6 \over x}⋅{2 \over y}={12 \over xy}\)

\({p \over 4}⋅{9 \over q}={9p \over 4q}\)

\(-{3 \over 5}⋅a=-{3a \over 5}\)

\({6 \over x}:{4 \over y}={6 \over x}⋅{y \over 4}={6y \over 4x}={3y \over 2x}\)

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

\({7p \over 3}+{p-8 \over 5}={35p \over 15}+{3(p-8) \over 15}={35p+3(p-8) \over 15}={38p-24 \over 15}\)

\({3y \over x}⋅{x+2 \over 9}={3y(x+2) \over 9x}={y(x+2) \over 3x}={xy+2y \over 3x}\)

\(-{7 \over 4}:{p-5q \over q}=-{7 \over 4}⋅{q \over p-5q}=-{7q \over 4(p-5q)}=-{7q \over 4p-20q}\)

\({2x^2+6x-40 \over 2x}={2x^2 \over 2x}+{6x \over 2x}-{40 \over 2x}=x+3-{20 \over x}\)

\({4x^2+6x-3 \over 8x^2}={4x^2 \over 8x^2}+{6x \over 8x^2}-{3 \over 8x^2}=\frac{1}{2}+{3 \over 4x}-{3 \over 8x^2}\)