\({9 \over 8x}-{5 \over 8x}={4 \over 8x}={1 \over 2x}\)

\({3 \over x}-{4 \over 9x}={27 \over 9x}-{4 \over 9x}={23 \over 9x}\)

\({6 \over 8a}+{5 \over 7b}={42b \over 56ab}+{40a \over 56ab}={42b+40a \over 56ab}={21b+20a \over 28ab}\)

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

\(6p+{8 \over 3p}={6p \over 1}⋅{3p \over 3p}+{8 \over 3p}={18p^2 \over 3p}+{8 \over 3p}={18p^2+8 \over 3p}\)

\({8a \over b}+{3 \over 5b}={40a \over 5b}+{3 \over 5b}={40a+3 \over 5b}\)

\({8y \over 2x}-{7x \over 4y}={16y^2 \over 4xy}-{7x^2 \over 4xy}={-7x^2+16y^2 \over 4xy}\)

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

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

\({6p \over -8p}=-\frac{3}{4}\)

\({-24a \over -4a}=6\)

\({-25xy \over -45xz}={5y \over 9z}\)

\({10b \over -12ab}=-{5 \over 6a}\)

\({20pqr \over 5qr}=4p\)

\({2xy \over y}-{6xz \over z}=2x-6x=-4x\)

\({9 \over x}⋅{2 \over y}={18 \over xy}\)

\({p \over 7}⋅{4 \over q}={4p \over 7q}\)

\(-{1 \over 8}⋅x=-{x \over 8}\)

\({8 \over a}:{7 \over b}={8 \over a}⋅{b \over 7}={8b \over 7a}\)

\(-{2 \over 3}:a=-{2 \over 3}:{a \over 1}=-{2 \over 3}⋅{1 \over a}=-{2 \over 3a}\)

\({3x \over 7}+{x-6 \over 9}={27x \over 63}+{7(x-6) \over 63}={27x+7(x-6) \over 63}={34x-42 \over 63}\)

\(-{2 \over 7}:{a+b \over b}=-{2 \over 7}⋅{b \over a+b}=-{2b \over 7(a+b)}=-{2b \over 7a+7b}\)

\({-9x-5 \over -7x-2}+1={-9x-5 \over -7x-2}-{-1(-7x-2) \over -7x-2}={-9x-5+1(-7x-2) \over -7x-2}={-9x-5-7x-2 \over -7x-2}={-16x-7 \over -7x-2}\)