\({9 \over 7p}-{3 \over 7p}={6 \over 7p}\)

\({9 \over a}+{8 \over 2a}={18 \over 2a}+{8 \over 2a}={26 \over 2a}={13 \over a}\)

\({2 \over 3a}+{6 \over 7b}={14b \over 21ab}+{18a \over 21ab}={14b+18a \over 21ab}\)

\(8-{2 \over 9x}={8 \over 1}-{2 \over 9x}={72x \over 9x}-{2 \over 9x}={72x-2 \over 9x}\)

\(2x+{9 \over 8x}={2x \over 1}⋅{8x \over 8x}+{9 \over 8x}={16x^2 \over 8x}+{9 \over 8x}={16x^2+9 \over 8x}\)

\({5a \over b}-{6 \over 8b}={40a \over 8b}-{6 \over 8b}={40a-6 \over 8b}={20a-3 \over 4b}\)

\({3y \over 6x}-{2x \over 7y}={21y^2 \over 42xy}-{12x^2 \over 42xy}={-12x^2+21y^2 \over 42xy}={-4x^2+7y^2 \over 14xy}\)

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

\({x \over 3x}={1 \over 3}\)

\({-21p \over 24p}=-\frac{7}{8}\)

\({27p \over -3p}=-9\)

\({20xy \over -32xz}=-{5y \over 8z}\)

\({-15b \over -24ab}={5 \over 8a}\)

\({15abc \over 5bc}=3a\)

\({5xy \over y}+{3xz \over z}=5x+3x=8x\)

\({7 \over a}⋅-{8 \over b}=-{56 \over ab}\)

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

\(-{4 \over 9}⋅p=-{4p \over 9}\)

\({7 \over x}:{2 \over y}={7 \over x}⋅{y \over 2}={7y \over 2x}\)

\(-{7 \over 2}:a=-{7 \over 2}:{a \over 1}=-{7 \over 2}⋅{1 \over a}=-{7 \over 2a}\)

\({4x \over 5}+{x-6 \over 9}={36x \over 45}+{5(x-6) \over 45}={36x+5(x-6) \over 45}={41x-30 \over 45}\)