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(-3) + (-7) = - 10 Spr - 10 + 3 = - 7
4 - 13 = - 9 Spr - 9 + 13 = 4
5 - (-22)= 27 Sprr 27 - 22 = 5
(-15) - (-15)= 0 Spr 0 - 15 = - 15