the answer to that question would be 2 because -3 + 9 would be 5 - 3 and would be 2.
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When you have two different signs together (a plus and a minus) the minus takes precedence (the minus "wins"). So, for example, 9 + -3 = 9 - 3 = 6.
2.8 times 4 plus 9 plus 3 minus 2.8 plus 4.2 is equal to 24.6
1 + 6 + 9 - 8 + 4 - 5 + 2 + 3 = -6
Zero
-9