Negative 11.
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11+-18 you are adding a negative so you take 18-11=7 and the answer is the opposite of that answer, so -7
3 + 11 + 11 + 11 + 12 + 13 + 15 + 15 + 16 + 17 + 19 = 143
Add or plus.
Positive nine, or plus eighteen.
8+11= 8+11