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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