Answer :
(iii) (a + b)(x + y) + (2a + 3b)(x + y) - (3a + 4b)(x + y)
= (x + y)[(a + b) + (2a + 3b) - 3a + 4b]
= (x + y)[3a + 4b - 3a - 4b]
= 0
.
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