5b plus 5-3b-7 is 2b-2.
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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.
7b + 16 = 5b + 247b - 5b = 24 - 162b = 8b = 4
10ab + 15b = 5b (2a + 3)