\({2 \over 4p}-{7 \over 4p}=-{5 \over 4p}\)

\({7 \over x}+{2 \over 5x}={35 \over 5x}+{2 \over 5x}={37 \over 5x}\)

\({5 \over 6a}+{3 \over 8b}={20b \over 24ab}+{9a \over 24ab}={20b+9a \over 24ab}\)

\(9-{7 \over 8x}={9 \over 1}-{7 \over 8x}={72x \over 8x}-{7 \over 8x}={72x-7 \over 8x}\)

\(6a+{7 \over 4a}={6a \over 1}⋅{4a \over 4a}+{7 \over 4a}={24a^2 \over 4a}+{7 \over 4a}={24a^2+7 \over 4a}\)

\({6x \over y}+{4 \over 8y}={48x \over 8y}+{4 \over 8y}={48x+4 \over 8y}={12x+1 \over 2y}\)

\({2b \over 9a}+{8a \over 4b}={8b^2 \over 36ab}+{72a^2 \over 36ab}={72a^2+8b^2 \over 36ab}={18a^2+2b^2 \over 9ab}\)

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

\({x \over 7x}={1 \over 7}\)

\({-8p \over 36p}=-\frac{2}{9}\)

\({32a \over 4a}=8\)

\({-20ab \over 28ac}=-{5b \over 7c}\)

\({25y \over 35xy}={5 \over 7x}\)

\({6xyz \over 3yz}=2x\)

\({5pq \over q}+{2pr \over r}=5p+2p=7p\)

\({7 \over a}⋅{3 \over b}={21 \over ab}\)

\({x \over 3}⋅-{9 \over y}=-{9x \over 3y}=-{3x \over y}\)

\(-{3 \over 5}⋅x=-{3x \over 5}\)

\({4 \over a}:{8 \over b}={4 \over a}⋅{b \over 8}={4b \over 8a}={b \over 2a}\)

\(-{5 \over 9}:p=-{5 \over 9}:{p \over 1}=-{5 \over 9}⋅{1 \over p}=-{5 \over 9p}\)

\({3a \over 5}+{a-1 \over 6}={18a \over 30}+{5(a-1) \over 30}={18a+5(a-1) \over 30}={23a-5 \over 30}\)

\({-7x-4 \over 3x+6}-5={-7x-4 \over 3x+6}-{5(3x+6) \over 3x+6}={-7x-4-5(3x+6) \over 3x+6}={-7x-4-15x-30 \over 3x+6}={-22x-34 \over 3x+6}\)

\({6a^2-3a+90 \over 3a}={6a^2 \over 3a}-{3a \over 3a}+{90 \over 3a}=2a-1+{30 \over a}\)

\({6a^2+2a+3 \over 5a^2}={6a^2 \over 5a^2}+{2a \over 5a^2}+{3 \over 5a^2}=1\frac{1}{5}+{2 \over 5a}+{3 \over 5a^2}\)