\({9 \over 4 a} - {6 \over 4 a} = {3 \over 4 a}\)

\({2 \over p} + {8 \over 9 p} = {18 \over 9 p} + {8 \over 9 p} = {26 \over 9 p}\)

\({6 \over 8 x} - {7 \over 4 y} = {6 y \over 8 x y} - {14 x \over 8 x y} = {6 y - 14 x \over 8 x y} = {3 y - 7 x \over 4 x y}\)

\(4 - {5 \over 8 x} = {4 \over 1} - {5 \over 8 x} = {32 x \over 8 x} - {5 \over 8 x} = {32 x - 5 \over 8 x}\)

\(4 a + {6 \over 7 a} = {4 a \over 1} ⋅ {7 a \over 7 a} + {6 \over 7 a} = {28 a^{2} \over 7 a} + {6 \over 7 a} = {28 a^{2} + 6 \over 7 a}\)

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

\({7 b \over 5 a} - {8 a \over 4 b} = {28 b^{2} \over 20 a b} - {40 a^{2} \over 20 a b} = {-40 a^{2} + 28 b^{2} \over 20 a b} = {-10 a^{2} + 7 b^{2} \over 5 a b}\)

\({6 p \over p} = {6 \over 1} = 6\)

\({a \over 6 a} = {1 \over 6}\)

\({-32 x \over -36 x} = \frac{8}{9}\)

\({24 p \over 3 p} = 8\)

\({-10 x y \over -45 x z} = {2 y \over 9 z}\)

\({6 b \over 16 a b} = {3 \over 8 a}\)

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

\({7 a b \over b} - {6 a c \over c} = 7 a - 6 a = a\)

\({7 \over a} ⋅ {3 \over b} = {21 \over a b}\)

\({p \over 8} ⋅ -{3 \over q} = -{3 p \over 8 q}\)

\({6 \over 7} ⋅ x = {6 x \over 7}\)

\({9 \over x} : {7 \over y} = {9 \over x} ⋅ {y \over 7} = {9 y \over 7 x}\)

\({8 \over 9} : a = {8 \over 9} : {a \over 1} = {8 \over 9} ⋅ {1 \over a} = {8 \over 9 a}\)

\({5 x \over 9} + {x - 3 \over 8} = {40 x \over 72} + {9 (x - 3) \over 72} = {40 x + 9 (x - 3) \over 72} = {49 x - 27 \over 72}\)

\({8 \over 3} : {a - b \over b} = {8 \over 3} ⋅ {b \over a - b} = {8 b \over 3 (a - b)} = {8 b \over 3 a - 3 b}\)

\({4 x + 8 \over 7 x - 2} - 9 = {4 x + 8 \over 7 x - 2} - {9 (7 x - 2) \over 7 x - 2} = {4 x + 8 - 9 (7 x - 2) \over 7 x - 2} = {4 x + 8 - 63 x + 18 \over 7 x - 2} = {-59 x + 26 \over 7 x - 2}\)