12 - ( -3), 15, 12 - 3, 9, -15 + 4, -11, -20 - (-5), -15, 125 + -5, 120, 17 + (-6), 11, -77 - 3, -80, 94 + (-9), 85, -67 + -7, -74, 77 + 3, 80

adding and subtracting integers

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