## Algebra 1

$\frac{3 - b}{b - 3}$
Since we already have common denominators, we can add and simplify the numerators: $\frac{3}{b - 3} - \frac{b}{b-3} =\frac{3 - b}{b - 3}$ $3-b \ne b-3$, so these cannot cancel out as common factors.