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(-4) + (-8) = -12
2 + (-7) =-5
(-5) + 5 =0
b 4 - 12 =-8
15 - (-4) = 19
(-1) - 9 = -10
0 - (-9) = 9
c (-13) - (-5) = -8
(-1) - (-7) =6
(-2) - 2 =-4
(-8) - (-8) = 0