\({4 \over 7 x} - {2 \over 7 x} = {2 \over 7 x}\)

\({7 \over a} + {9 \over 5 a} = {35 \over 5 a} + {9 \over 5 a} = {44 \over 5 a}\)

\({5 \over 7 a} + {3 \over 2 b} = {10 b \over 14 a b} + {21 a \over 14 a b} = {10 b + 21 a \over 14 a b}\)

\(9 - {2 \over 3 p} = {9 \over 1} - {2 \over 3 p} = {27 p \over 3 p} - {2 \over 3 p} = {27 p - 2 \over 3 p}\)

\(6 x - {7 \over 9 x} = {6 x \over 1} ⋅ {9 x \over 9 x} - {7 \over 9 x} = {54 x^{2} \over 9 x} - {7 \over 9 x} = {54 x^{2} - 7 \over 9 x}\)

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

\({6 b \over 9 a} - {2 a \over 5 b} = {30 b^{2} \over 45 a b} - {18 a^{2} \over 45 a b} = {-18 a^{2} + 30 b^{2} \over 45 a b} = {-6 a^{2} + 10 b^{2} \over 15 a b}\)

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

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

\({28 x \over -32 x} = -\frac{7}{8}\)

\({12 a \over -4 a} = -3\)

\({-16 p q \over -18 p r} = {8 q \over 9 r}\)

\({-16 y \over -18 x y} = {8 \over 9 x}\)

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

\({5 x y \over y} + {6 x z \over z} = 5 x + 6 x = 11 x\)

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

\({a \over 4} ⋅ {9 \over b} = {9 a \over 4 b}\)

\({8 \over 9} ⋅ x = {8 x \over 9}\)

\({5 \over p} : {7 \over q} = {5 \over p} ⋅ {q \over 7} = {5 q \over 7 p}\)

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

\({4 a \over 3} + {a + 9 \over 5} = {20 a \over 15} + {3 (a + 9) \over 15} = {20 a + 3 (a + 9) \over 15} = {23 a + 27 \over 15}\)

\(-{5 \over 6} : {a + 8 b \over b} = -{5 \over 6} ⋅ {b \over a + 8 b} = -{5 b \over 6 (a + 8 b)} = -{5 b \over 6 a + 48 b}\)

\({-9 x - 4 \over -2 x - 6} - 8 = {-9 x - 4 \over -2 x - 6} + {-8 (-2 x - 6) \over -2 x - 6} = {-9 x - 4 - 8 (-2 x - 6) \over -2 x - 6} = {-9 x - 4 + 16 x + 48 \over -2 x - 6} = {7 x + 44 \over -2 x - 6}\)