\({9 \over 7 a} - {6 \over 7 a} = {3 \over 7 a}\)

\({6 \over p} - {4 \over 5 p} = {30 \over 5 p} - {4 \over 5 p} = {26 \over 5 p}\)

\({9 \over 4 a} - {5 \over 8 b} = {18 b \over 8 a b} - {5 a \over 8 a b} = {18 b - 5 a \over 8 a b}\)

\(5 - {4 \over 3 x} = {5 \over 1} - {4 \over 3 x} = {15 x \over 3 x} - {4 \over 3 x} = {15 x - 4 \over 3 x}\)

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

\({4 a \over b} - {5 \over 7 b} = {28 a \over 7 b} - {5 \over 7 b} = {28 a - 5 \over 7 b}\)

\({9 b \over 3 a} - {7 a \over 2 b} = {18 b^{2} \over 6 a b} - {21 a^{2} \over 6 a b} = {-21 a^{2} + 18 b^{2} \over 6 a b} = {-7 a^{2} + 6 b^{2} \over 2 a b}\)

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

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

\({-25 x \over -40 x} = \frac{5}{8}\)

\({-30 x \over 5 x} = -6\)

\({-24 a b \over 28 a c} = -{6 b \over 7 c}\)

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

\({20 a b c \over -5 b c} = -4 a\)

\({6 p q \over q} - {2 p r \over r} = 6 p - 2 p = 4 p\)

\({2 \over x} ⋅ {4 \over y} = {8 \over x y}\)

\({a \over 4} ⋅ -{6 \over b} = -{6 a \over 4 b} = -{3 a \over 2 b}\)

\(-{7 \over 4} ⋅ a = -{7 a \over 4}\)

\({8 \over x} : {7 \over y} = {8 \over x} ⋅ {y \over 7} = {8 y \over 7 x}\)

\({3 \over 2} : p = {3 \over 2} : {p \over 1} = {3 \over 2} ⋅ {1 \over p} = {3 \over 2 p}\)

\({5 x \over 8} + {x + 4 \over 7} = {35 x \over 56} + {8 (x + 4) \over 56} = {35 x + 8 (x + 4) \over 56} = {43 x + 32 \over 56}\)