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

\({8 \over x}-{9 \over 5x}={40 \over 5x}-{9 \over 5x}={31 \over 5x}\)

\({4 \over 9x}-{2 \over 7y}={28y \over 63xy}-{18x \over 63xy}={28y-18x \over 63xy}\)

\(5-{7 \over 6p}={5 \over 1}-{7 \over 6p}={30p \over 6p}-{7 \over 6p}={30p-7 \over 6p}\)

\({8a \over b}+{3 \over 6b}={48a \over 6b}+{3 \over 6b}={48a+3 \over 6b}={16a+1 \over 2b}\)

\({2p \over p}={2 \over 1}=2\)

\({x \over 2x}={1 \over 2}\)

\({-20x \over 28x}=-\frac{5}{7}\)

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

\({8ab \over -10ac}=-{4b \over 5c}\)

\({-14y \over 18xy}=-{7 \over 9x}\)

\({30abc \over 5bc}=6a\)

\({4ab \over b}+{6ac \over c}=4a+6a=10a\)

\(6p+{7 \over 2p}={6p \over 1}⋅{2p \over 2p}+{7 \over 2p}={12p^2 \over 2p}+{7 \over 2p}={12p^2+7 \over 2p}\)

\({7y \over 8x}-{5x \over 4y}={7y^2 \over 8xy}-{10x^2 \over 8xy}={-10x^2+7y^2 \over 8xy}\)

\({7 \over x}⋅-{4 \over y}=-{28 \over xy}\)

\({a \over 5}⋅{9 \over b}={9a \over 5b}\)

\(-{4 \over 5}⋅a=-{4a \over 5}\)

\({9b \over a}⋅{a-6 \over 2}={9b(a-6) \over 2a}={9ab-54b \over 2a}\)

\({7 \over x}:{8 \over y}={7 \over x}⋅{y \over 8}={7y \over 8x}\)

\(-{9 \over 4}:a=-{9 \over 4}:{a \over 1}=-{9 \over 4}⋅{1 \over a}=-{9 \over 4a}\)

\({3 \over 4}:{x-2y \over y}={3 \over 4}⋅{y \over x-2y}={3y \over 4(x-2y)}={3y \over 4x-8y}\)

\({8p \over 9}+{p-7 \over 4}={32p \over 36}+{9(p-7) \over 36}={32p+9(p-7) \over 36}={41p-63 \over 36}\)

\({-6p+2 \over 9p-1}+4={-6p+2 \over 9p-1}+{4(9p-1) \over 9p-1}={-6p+2+4(9p-1) \over 9p-1}={-6p+2+36p-4 \over 9p-1}={30p-2 \over 9p-1}\)

\({6a^2+2a+40 \over 2a}={6a^2 \over 2a}+{2a \over 2a}+{40 \over 2a}=3a+1+{20 \over a}\)

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