20 - 39 - -19, 7 - 15 - -8, -5 - 2 - -7, -7 - 13 - -20, -9 - 5 - -14, 6 - -2 - 8, 10 - -4 - 14, -3 - -12 - 9, 5 + -7 - -2, 12 + -15 - -3, -8 + -5 - -13, -11 + -7 - -18, -7 + -2 - -9, -3 + 7 - 4, -12 + 7 - -5, -15 + 8 - -7,

negative numbers add-sub

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