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=-5-12+10
=-7
= -5 + -12 - -10
= -17 + 10
= -7
2. AB - BC + CD - ABC = (-2x3) - (3x-4) + (-4x5) - (-2x3x-4)
= -6 - -12 + -20 - 24
= -6 + 12 + -44
= -38