Correct: (+5)+(-11), (-13)+(+7), (-8)+(-2)+(+4), (-16)+(+10), (-1)+(-2)+(-3), (+18)+(-24), (+15)+(-21), -(-6)+(-12), (+17)+(-23), (-14)-(-8), (-4)+(-2), (+23)+(-29), Incorrect: (-11)+(-5), (+11)+(-5), (+13)+(-7), (-16)+(+8), (+18)+(-12), -(-6)+(-6)+(+6), (-17)+(+23), (-12)+(-6), (+17)+(-11), (+8)-(+2), (+23)-(-29), (-1)-(-5),

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