\({9 \over 7 p} + {4 \over 7 p} = {13 \over 7 p}\)

\({4 \over a} - {7 \over 6 a} = {24 \over 6 a} - {7 \over 6 a} = {17 \over 6 a}\)

\({9 \over 2 x} + {6 \over 8 y} = {36 y \over 8 x y} + {6 x \over 8 x y} = {36 y + 6 x \over 8 x y} = {18 y + 3 x \over 4 x y}\)

\(7 - {5 \over 6 x} = {7 \over 1} - {5 \over 6 x} = {42 x \over 6 x} - {5 \over 6 x} = {42 x - 5 \over 6 x}\)

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

\({3 a \over b} + {9 \over 5 b} = {15 a \over 5 b} + {9 \over 5 b} = {15 a + 9 \over 5 b}\)

\({5 y \over 6 x} - {7 x \over 3 y} = {5 y^{2} \over 6 x y} - {14 x^{2} \over 6 x y} = {-14 x^{2} + 5 y^{2} \over 6 x y}\)

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

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

\({8 p \over -20 p} = -\frac{2}{5}\)

\({25 a \over -5 a} = -5\)

\({12 x y \over -20 x z} = -{3 y \over 5 z}\)

\({-15 b \over 25 a b} = -{3 \over 5 a}\)

\({14 x y z \over 2 y z} = 7 x\)

\({4 p q \over q} + {5 p r \over r} = 4 p + 5 p = 9 p\)

\({7 \over a} ⋅ {2 \over b} = {14 \over a b}\)

\({p \over 4} ⋅ {3 \over q} = {3 p \over 4 q}\)

\({4 \over 7} ⋅ a = {4 a \over 7}\)

\({6 \over x} : {7 \over y} = {6 \over x} ⋅ {y \over 7} = {6 y \over 7 x}\)

\(-{6 \over 5} : x = -{6 \over 5} : {x \over 1} = -{6 \over 5} ⋅ {1 \over x} = -{6 \over 5 x}\)

\({8 a \over 5} + {a + 1 \over 7} = {56 a \over 35} + {5 (a + 1) \over 35} = {56 a + 5 (a + 1) \over 35} = {61 a + 5 \over 35}\)

\({5 \over 4} : {x - 8 y \over y} = {5 \over 4} ⋅ {y \over x - 8 y} = {5 y \over 4 (x - 8 y)} = {5 y \over 4 x - 32 y}\)

\({-4 a + 1 \over -7 a + 6} - 3 = {-4 a + 1 \over -7 a + 6} + {-3 (-7 a + 6) \over -7 a + 6} = {-4 a + 1 - 3 (-7 a + 6) \over -7 a + 6} = {-4 a + 1 + 21 a - 18 \over -7 a + 6} = {17 a - 17 \over -7 a + 6}\)