$$\frac{18\left(-1\right)}{2-3}$$
Multiply $18$ and $-1$ to get $-18$.$$\frac{-18}{2-3}$$
Subtract $3$ from $2$ to get $-1$.$$\frac{-18}{-1}$$
Fraction $\frac{-18}{-1}$ can be simplified to $18$ by removing the negative sign from both the numerator and the denominator.$$18$$