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= 2ab + 0 + 5d = 2ab + 5d
edit:
5ab + 6d + 2bc - d + 3ab - 2bc = 5ab + 3ab + 2bc - 2bc - d + 6d
= 8ab + 0 + 5d = 8ab + 5d
5ab + 6d + 2bc - d + 3ab - 2bc
= 5ab + 3ab + 2bc - 2bc + 6d - d
= 8ab + 5d