It is -2.
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Positive 3 plus negative 5 minus negative 2 minus positive 4 is equal to -4.
-2*(-2)2 + 0*(-2) + 9 = -2*4 + 9 = -8 + 9 = 1
- 4 + (- 4) = - 8
4 + (-2) + 5 = 7 BECAUSE adding a negative number is the same as subtracting the number, so 4 + (-2) = 2 and 2 + 5 = 7
0, of course! 4+-4=4-4. One negative plus one positive equals one negative.