\({7 \over 2a}+{3 \over 2a}={10 \over 2a}={5 \over a}\)

\({4 \over p}+{8 \over 3p}={12 \over 3p}+{8 \over 3p}={20 \over 3p}\)

\({3 \over 7x}-{4 \over 2y}={6y \over 14xy}-{28x \over 14xy}={6y-28x \over 14xy}={3y-14x \over 7xy}\)

\(3-{5 \over 7x}={3 \over 1}-{5 \over 7x}={21x \over 7x}-{5 \over 7x}={21x-5 \over 7x}\)

\(3a-{2 \over 5a}={3a \over 1}⋅{5a \over 5a}-{2 \over 5a}={15a^2 \over 5a}-{2 \over 5a}={15a^2-2 \over 5a}\)

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

\({8y \over 4x}-{5x \over 9y}={72y^2 \over 36xy}-{20x^2 \over 36xy}={-20x^2+72y^2 \over 36xy}={-5x^2+18y^2 \over 9xy}\)

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

\({p \over 5p}={1 \over 5}\)

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

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

\({8xy \over 14xz}={4y \over 7z}\)

\({9y \over 12xy}={3 \over 4x}\)

\({20abc \over 5bc}=4a\)

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

\({8 \over x}⋅{3 \over y}={24 \over xy}\)

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

\(-{4 \over 9}⋅a=-{4a \over 9}\)

\({2 \over a}:{4 \over b}={2 \over a}⋅{b \over 4}={2b \over 4a}={b \over 2a}\)

\({2 \over 9}:p={2 \over 9}:{p \over 1}={2 \over 9}⋅{1 \over p}={2 \over 9p}\)