Let's reduce: $\frac{9x}{-3}$

ⓘ The sign of a fraction goes in front of the bar, whether it comes from the numerator or the denominator: $\frac{9x}{-3}$ = $-\frac{9x}{3}$

$-\frac{9x}{3}$

ⓘ A fraction is simplified by dividing the numerator and the denominator by the same number: $-\frac{9x}{3}$ = $-3x$

▶Simplified form:   $-3x$