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1. -5 + (-12) - 6 = -5 - 12 - 6 = - 23
2. -8 x 3 - (-11) = -8 x 3 + 11 = - 24 + 11 = - 13
3. 4 + (-12) x 7 = 4 - 12 x 7 = -80
4. -16 + 20 : (-4) = -21