\({4 \over 3 x} - {8 \over 3 x} = -{4 \over 3 x}\)

\({7 \over a} - {2 \over 5 a} = {35 \over 5 a} - {2 \over 5 a} = {33 \over 5 a}\)

\({5 \over 9 x} - {7 \over 2 y} = {10 y \over 18 x y} - {63 x \over 18 x y} = {10 y - 63 x \over 18 x y}\)

\(2 - {7 \over 5 a} = {2 \over 1} - {7 \over 5 a} = {10 a \over 5 a} - {7 \over 5 a} = {10 a - 7 \over 5 a}\)

\(5 p - {7 \over 6 p} = {5 p \over 1} ⋅ {6 p \over 6 p} - {7 \over 6 p} = {30 p^{2} \over 6 p} - {7 \over 6 p} = {30 p^{2} - 7 \over 6 p}\)

\({8 x \over y} + {3 \over 5 y} = {40 x \over 5 y} + {3 \over 5 y} = {40 x + 3 \over 5 y}\)

\({3 q \over 9 p} - {5 p \over 7 q} = {21 q^{2} \over 63 p q} - {45 p^{2} \over 63 p q} = {-45 p^{2} + 21 q^{2} \over 63 p q} = {-15 p^{2} + 7 q^{2} \over 21 p q}\)

\({7 a \over a} = {7 \over 1} = 7\)

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

\({-20 a \over -45 a} = \frac{4}{9}\)

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

\({25 p q \over 30 p r} = {5 q \over 6 r}\)

\({-4 y \over 10 x y} = -{2 \over 5 x}\)

\({-16 x y z \over -4 y z} = 4 x\)

\({5 a b \over b} - {4 a c \over c} = 5 a - 4 a = a\)

\({5 \over x} ⋅ {7 \over y} = {35 \over x y}\)

\({a \over 6} ⋅ {7 \over b} = {7 a \over 6 b}\)

\({9 \over 7} ⋅ p = {9 p \over 7}\)

\({3 \over x} : {7 \over y} = {3 \over x} ⋅ {y \over 7} = {3 y \over 7 x}\)

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