\({3 \over 8p}-{9 \over 8p}=-{6 \over 8p}=-{3 \over 4p}\)

\({8 \over a}-{3 \over 2a}={16 \over 2a}-{3 \over 2a}={13 \over 2a}\)

\({9 \over 3x}-{2 \over 4y}={36y \over 12xy}-{6x \over 12xy}={36y-6x \over 12xy}={6y-x \over 2xy}\)

\(6+{3 \over 5x}={6 \over 1}+{3 \over 5x}={30x \over 5x}+{3 \over 5x}={30x+3 \over 5x}\)

\(2a+{4 \over 9a}={2a \over 1}⋅{9a \over 9a}+{4 \over 9a}={18a^2 \over 9a}+{4 \over 9a}={18a^2+4 \over 9a}\)

\({2a \over b}-{8 \over 3b}={6a \over 3b}-{8 \over 3b}={6a-8 \over 3b}\)

\({5y \over 8x}-{9x \over 7y}={35y^2 \over 56xy}-{72x^2 \over 56xy}={-72x^2+35y^2 \over 56xy}\)

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

\({p \over 8p}={1 \over 8}\)

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

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

\({14xy \over -18xz}=-{7y \over 9z}\)

\({-6q \over -21pq}={2 \over 7p}\)

\({18xyz \over -3yz}=-6x\)

\({5ab \over b}+{3ac \over c}=5a+3a=8a\)

\({6 \over x}⋅{7 \over y}={42 \over xy}\)

\({a \over 4}⋅{7 \over b}={7a \over 4b}\)

\({3 \over 8}⋅x={3x \over 8}\)

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

\(-{9 \over 4}:p=-{9 \over 4}:{p \over 1}=-{9 \over 4}⋅{1 \over p}=-{9 \over 4p}\)

\({5p \over 9}+{p+8 \over 4}={20p \over 36}+{9(p+8) \over 36}={20p+9(p+8) \over 36}={29p+72 \over 36}\)

\({7 \over 2}:{x-9y \over y}={7 \over 2}⋅{y \over x-9y}={7y \over 2(x-9y)}={7y \over 2x-18y}\)

\({-2x+4 \over 5x-9}-6={-2x+4 \over 5x-9}-{6(5x-9) \over 5x-9}={-2x+4-6(5x-9) \over 5x-9}={-2x+4-30x+54 \over 5x-9}={-32x+58 \over 5x-9}\)