Calculate: -/(5) 18+(-/(4) 9) =

Expression: $$- \frac { 5 } { 18 } + ( - \frac { 4 } { 9 } ) =$$

Least common multiple of $18$ and $9$ is $18$. Convert $-\frac{5}{18}$ and $\frac{4}{9}$ to fractions with denominator $18$.

$$-\frac{5}{18}-\frac{8}{18}$$

Since $-\frac{5}{18}$ and $\frac{8}{18}$ have the same denominator, subtract them by subtracting their numerators.

$$\frac{-5-8}{18}$$

Subtract $8$ from $-5$ to get $-13$.

$$-\frac{13}{18}$$

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