Evaluate: 3

Evaluate: $3$

Divide $21$ by $-3$ to get $-7$.

$$-7-2\left(-5\right)$$

Multiply $2$ and $-5$ to get $-10$.

$$-7-\left(-10\right)$$

The opposite of $-10$ is $10$.

$$-7+10$$

Add $-7$ and $10$ to get $3$.

$$3$$