Answer
The expression is evaluated to $-10$.
Work Step by Step
This expression can be evaluated starting from the left and proceeding to the right because the only operations found in this expression are addition and subtraction, which should be evaluated in order from left to right.
We first add $-9$ to $-11$ to get:
$$-20 + 7 - (-3)$$
Then add $7$ to get:
$$-13 - (-3)$$
To subtract a negative number, you actually add the number because a negative and a negative equals a positive:
$$-13 + 3$$
The expression is evaluated to $-10$.
