\({7 \over 5p}+{2 \over 5p}={9 \over 5p}\)

\({6 \over x}+{2 \over 9x}={54 \over 9x}+{2 \over 9x}={56 \over 9x}\)

\({3 \over 5x}+{4 \over 8y}={24y \over 40xy}+{20x \over 40xy}={24y+20x \over 40xy}={6y+5x \over 10xy}\)

\(6-{4 \over 9a}={6 \over 1}-{4 \over 9a}={54a \over 9a}-{4 \over 9a}={54a-4 \over 9a}\)

\(8a+{7 \over 2a}={8a \over 1}⋅{2a \over 2a}+{7 \over 2a}={16a^2 \over 2a}+{7 \over 2a}={16a^2+7 \over 2a}\)

\({4p \over q}+{6 \over 5q}={20p \over 5q}+{6 \over 5q}={20p+6 \over 5q}\)

\({7y \over 6x}-{8x \over 5y}={35y^2 \over 30xy}-{48x^2 \over 30xy}={-48x^2+35y^2 \over 30xy}\)

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

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

\({-20a \over -25a}=\frac{4}{5}\)

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

\({-9pq \over 21pr}=-{3q \over 7r}\)

\({-15y \over -20xy}={3 \over 4x}\)

\({-28abc \over -4bc}=7a\)

\({5xy \over y}+{4xz \over z}=5x+4x=9x\)

\({8 \over a}⋅{4 \over b}={32 \over ab}\)

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

\({1 \over 6}⋅x={x \over 6}\)

\({2 \over p}:{4 \over q}={2 \over p}⋅{q \over 4}={2q \over 4p}={q \over 2p}\)

\({3 \over 5}:x={3 \over 5}:{x \over 1}={3 \over 5}⋅{1 \over x}={3 \over 5x}\)