\({3 \over 5 p} + {2 \over 5 p} = {5 \over 5 p} = {1 \over p}\)

\({8 \over x} + {2 \over 9 x} = {72 \over 9 x} + {2 \over 9 x} = {74 \over 9 x}\)

\({9 \over 5 x} + {6 \over 2 y} = {18 y \over 10 x y} + {30 x \over 10 x y} = {18 y + 30 x \over 10 x y} = {9 y + 15 x \over 5 x y}\)

\(2 - {5 \over 8 a} = {2 \over 1} - {5 \over 8 a} = {16 a \over 8 a} - {5 \over 8 a} = {16 a - 5 \over 8 a}\)

\(4 a - {7 \over 2 a} = {4 a \over 1} ⋅ {2 a \over 2 a} - {7 \over 2 a} = {8 a^{2} \over 2 a} - {7 \over 2 a} = {8 a^{2} - 7 \over 2 a}\)

\({5 x \over y} - {4 \over 6 y} = {30 x \over 6 y} - {4 \over 6 y} = {30 x - 4 \over 6 y} = {15 x - 2 \over 3 y}\)

\({9 y \over 2 x} + {3 x \over 7 y} = {63 y^{2} \over 14 x y} + {6 x^{2} \over 14 x y} = {6 x^{2} + 63 y^{2} \over 14 x y}\)

\({4 p \over p} = {4 \over 1} = 4\)

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

\({-10 a \over -45 a} = \frac{2}{9}\)

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

\({-6 p q \over 10 p r} = -{3 q \over 5 r}\)

\({-4 y \over 6 x y} = -{2 \over 3 x}\)

\({15 x y z \over -5 y z} = -3 x\)

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

\({3 \over x} ⋅ -{8 \over y} = -{24 \over x y}\)

\({a \over 7} ⋅ -{4 \over b} = -{4 a \over 7 b}\)

\(-{9 \over 7} ⋅ x = -{9 x \over 7}\)

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

\(-{7 \over 8} : a = -{7 \over 8} : {a \over 1} = -{7 \over 8} ⋅ {1 \over a} = -{7 \over 8 a}\)

\({8 a \over 3} + {a - 6 \over 7} = {56 a \over 21} + {3 (a - 6) \over 21} = {56 a + 3 (a - 6) \over 21} = {59 a - 18 \over 21}\)

\(-{9 \over 4} : {p - 8 q \over q} = -{9 \over 4} ⋅ {q \over p - 8 q} = -{9 q \over 4 (p - 8 q)} = -{9 q \over 4 p - 32 q}\)

\({-9 a - 8 \over -4 a + 1} + 5 = {-9 a - 8 \over -4 a + 1} - {-5 (-4 a + 1) \over -4 a + 1} = {-9 a - 8 + 5 (-4 a + 1) \over -4 a + 1} = {-9 a - 8 - 20 a + 5 \over -4 a + 1} = {-29 a - 3 \over -4 a + 1}\)