\({3 \over 4 p} + {5 \over 4 p} = {8 \over 4 p} = {2 \over p}\)

\({6 \over x} - {5 \over 8 x} = {48 \over 8 x} - {5 \over 8 x} = {43 \over 8 x}\)

\({5 \over 7 x} + {8 \over 6 y} = {30 y \over 42 x y} + {56 x \over 42 x y} = {30 y + 56 x \over 42 x y} = {15 y + 28 x \over 21 x y}\)

\(9 - {6 \over 5 a} = {9 \over 1} - {6 \over 5 a} = {45 a \over 5 a} - {6 \over 5 a} = {45 a - 6 \over 5 a}\)

\(7 a - {9 \over 4 a} = {7 a \over 1} ⋅ {4 a \over 4 a} - {9 \over 4 a} = {28 a^{2} \over 4 a} - {9 \over 4 a} = {28 a^{2} - 9 \over 4 a}\)

\({3 p \over q} - {9 \over 7 q} = {21 p \over 7 q} - {9 \over 7 q} = {21 p - 9 \over 7 q}\)

\({4 b \over 3 a} + {9 a \over 2 b} = {8 b^{2} \over 6 a b} + {27 a^{2} \over 6 a b} = {27 a^{2} + 8 b^{2} \over 6 a b}\)

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

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

\({-4 x \over 14 x} = -\frac{2}{7}\)

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

\({-28 a b \over 32 a c} = -{7 b \over 8 c}\)

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

\({16 a b c \over -4 b c} = -4 a\)

\({7 p q \over q} - {4 p r \over r} = 7 p - 4 p = 3 p\)

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

\({a \over 9} ⋅ {6 \over b} = {6 a \over 9 b} = {2 a \over 3 b}\)

\({8 \over 3} ⋅ x = {8 x \over 3}\)

\({9 \over p} : {6 \over q} = {9 \over p} ⋅ {q \over 6} = {9 q \over 6 p} = {3 q \over 2 p}\)

\({7 \over 5} : a = {7 \over 5} : {a \over 1} = {7 \over 5} ⋅ {1 \over a} = {7 \over 5 a}\)

\({p \over 7} + {p - 5 \over 3} = {3 p \over 21} + {7 (p - 5) \over 21} = {3 p + 7 (p - 5) \over 21} = {10 p - 35 \over 21}\)