3a + (3b - 2a) + 5b =3a + 3b - 2a + 5b =(3a - 2a) + (3b + 5b) =a + 8b
add like terms: 3a -2a -5b + 6b +3b - 7b = a -3b
ok, let's see: (3a-2a) + (2b+5b) +(-c +3c) = a + 7b +2c I think that's right.
3a+5b+7a=
2a+5b isn't possible the answer is still 2a+5b.
a + 7b + 2c
Ans. 2a-5b
3a + 2a = 5a
3a + 5b - 6a - 9b = -3a - 4b
a + a + a - 2a = 3a - 2a = a
2a + 5a + 3a = 10a
2a + 3a = 5a