Solve for: -/(1) 3+(-/(4) 15)

Expression: $$- \frac { 1 } { 3 } + ( - \frac { 4 } { 15 } )$$

Least common multiple of $3$ and $15$ is $15$. Convert $-\frac{1}{3}$ and $\frac{4}{15}$ to fractions with denominator $15$.

$$-\frac{5}{15}-\frac{4}{15}$$

Since $-\frac{5}{15}$ and $\frac{4}{15}$ have the same denominator, subtract them by subtracting their numerators.

$$\frac{-5-4}{15}$$

Subtract $4$ from $-5$ to get $-9$.

$$\frac{-9}{15}$$

Reduce the fraction $\frac{-9}{15}$ to lowest terms by extracting and canceling out $3$.

$$-\frac{3}{5}$$