I have this:
j + k = (2a + 1) + (2b + 1)
j + k = 2a + 2b + 2
Is the extra 2 (in the second line) came from the sum of the two ones? What if I have this:
j + k = (3a + 3) + (4b + 3)
would be OK to simplify it like this
j + k = 3a + 4b + 6
Or there is a rule for that?