\({8 \over 6a}-{7 \over 6a}={1 \over 6a}\)

\({9 \over p}-{6 \over 7p}={63 \over 7p}-{6 \over 7p}={57 \over 7p}\)

\({8 \over 9x}-{3 \over 6y}={16y \over 18xy}-{9x \over 18xy}={16y-9x \over 18xy}\)

\(3+{5 \over 4a}={3 \over 1}+{5 \over 4a}={12a \over 4a}+{5 \over 4a}={12a+5 \over 4a}\)

\({8x \over y}-{2 \over 5y}={40x \over 5y}-{2 \over 5y}={40x-2 \over 5y}\)

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

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

\({-20x \over 35x}=-\frac{4}{7}\)

\({20x \over -5x}=-4\)

\({-10ab \over 25ac}=-{2b \over 5c}\)

\({16y \over -36xy}=-{4 \over 9x}\)

\({-4abc \over -2bc}=2a\)

\({2xy \over y}+{6xz \over z}=2x+6x=8x\)