9+2=11, because 2 negatives equal a plus (--=+).
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negative 9 -9
2 - -9 = 2 + 9 = 11
because both are minus and minus and minus is below zero, it would be 2 further below zero, -7-2=9
a negative minus a positive is a negative ex: -12-13=-25 -9-2=-11 -100-1=-101
-18 minus 9 is -27