Negative 15 (-15). Subtracting a positive yields the same result as adding a negative.
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Positive 3 plus negative 5 minus negative 2 minus positive 4 is equal to -4.
-4 minus -12 is 8.
-12 * * * * * Wrong! -4 minus -8 = -4 + 8 = +4
(-2) - 11 = -13
-4 - 6 - (-10) = 0