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a) (23a5b−4c6)−2⋅(16a−7b−9c−5)3= (23)−2(a5)−2(b−4)−2(c6)−2⋅163(a−7)3(b−9)3(c−5)3=
=2−6a−10b8c−12⋅(24)3a−21b−27c−15=
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