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-3ac+5bc+abc
=-3(-4)(-5)+5(2)(-5)+(-4)(2)(-5)
=-60+(-50)+40
=-110+40
=-70
= -3(ac)+5(bc)+abc
= -3(-4×-5)+5(2×(-5))+(-4×2×(-5))
= -3(20)+5(-10)+40
= -60+(-50)+40
= -110+40
= -70
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