5ab-2ab+4a-b+5b
= 3ab+4a+4b
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Not necessarily, but with suitable choice of a, b and y it can be..
6a2 + 5ab - 6b2 = (3a - 2b)(2a + 3b)
3a+5b+7a=
3a + (3b - 2a) + 5b =3a + 3b - 2a + 5b =(3a - 2a) + (3b + 5b) =a + 8b
2a+5b isn't possible the answer is still 2a+5b.