\({4 \over 8 a} + {6 \over 8 a} = {10 \over 8 a} = {5 \over 4 a}\)

\({9 \over x} - {2 \over 7 x} = {63 \over 7 x} - {2 \over 7 x} = {61 \over 7 x}\)

\({5 \over 3 p} + {4 \over 7 q} = {35 q \over 21 p q} + {12 p \over 21 p q} = {35 q + 12 p \over 21 p q}\)

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

\(5 a - {2 \over 9 a} = {5 a \over 1} ⋅ {9 a \over 9 a} - {2 \over 9 a} = {45 a^{2} \over 9 a} - {2 \over 9 a} = {45 a^{2} - 2 \over 9 a}\)

\({9 p \over q} + {3 \over 4 q} = {36 p \over 4 q} + {3 \over 4 q} = {36 p + 3 \over 4 q}\)

\({4 b \over 8 a} - {2 a \over 6 b} = {12 b^{2} \over 24 a b} - {8 a^{2} \over 24 a b} = {-8 a^{2} + 12 b^{2} \over 24 a b} = {-2 a^{2} + 3 b^{2} \over 6 a b}\)

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

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

\({20 x \over 24 x} = \frac{5}{6}\)

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

\({10 x y \over 18 x z} = {5 y \over 9 z}\)

\({-9 q \over 15 p q} = -{3 \over 5 p}\)

\({-8 a b c \over 2 b c} = -4 a\)

\({4 x y \over y} - {5 x z \over z} = 4 x - 5 x = -x\)

\({2 \over a} ⋅ {9 \over b} = {18 \over a b}\)

\({a \over 6} ⋅ -{3 \over b} = -{3 a \over 6 b} = -{a \over 2 b}\)

\(-{9 \over 5} ⋅ x = -{9 x \over 5}\)

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

\(-{2 \over 5} : p = -{2 \over 5} : {p \over 1} = -{2 \over 5} ⋅ {1 \over p} = -{2 \over 5 p}\)