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= 5ab + 2bc - d - 3ab + 2bc - 6d
= 5ab - 3ab + 2bc + 2bc - d - 6d
= 2ab + 4bc - 7d
= (5ab-3ab)+(2bc-2bc)-(d+6d)
=2ab-7d.
kalo gak salah seperti ini