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

\({3 \over p} - {5 \over 6 p} = {18 \over 6 p} - {5 \over 6 p} = {13 \over 6 p}\)

\({2 \over 5 x} + {7 \over 6 y} = {12 y \over 30 x y} + {35 x \over 30 x y} = {12 y + 35 x \over 30 x y}\)

\(3 - {5 \over 9 a} = {3 \over 1} - {5 \over 9 a} = {27 a \over 9 a} - {5 \over 9 a} = {27 a - 5 \over 9 a}\)

\(4 x - {2 \over 5 x} = {4 x \over 1} ⋅ {5 x \over 5 x} - {2 \over 5 x} = {20 x^{2} \over 5 x} - {2 \over 5 x} = {20 x^{2} - 2 \over 5 x}\)

\({6 a \over b} - {3 \over 5 b} = {30 a \over 5 b} - {3 \over 5 b} = {30 a - 3 \over 5 b}\)

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

\({9 p \over p} = {9 \over 1} = 9\)

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

\({-10 x \over -25 x} = \frac{2}{5}\)

\({-18 p \over -2 p} = 9\)

\({-10 x y \over 14 x z} = -{5 y \over 7 z}\)

\({25 b \over -45 a b} = -{5 \over 9 a}\)

\({20 x y z \over 4 y z} = 5 x\)

\({7 a b \over b} - {4 a c \over c} = 7 a - 4 a = 3 a\)

\({2 \over x} ⋅ -{3 \over y} = -{6 \over x y}\)

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

\({4 \over 3} ⋅ p = {4 p \over 3}\)

\({6 \over x} : {2 \over y} = {6 \over x} ⋅ {y \over 2} = {6 y \over 2 x} = {3 y \over x}\)

\(-{7 \over 9} : a = -{7 \over 9} : {a \over 1} = -{7 \over 9} ⋅ {1 \over a} = -{7 \over 9 a}\)

\({9 p \over 2} + {p + 5 \over 7} = {63 p \over 14} + {2 (p + 5) \over 14} = {63 p + 2 (p + 5) \over 14} = {65 p + 10 \over 14}\)