If both are unknown, you have to keep it as a+b. If they're known, just add them
Chat with our AI personalities
(b+5)
Assuming that a and b are two non-negative numbers, then their sum is a + b and the difference is |a - b|.
3(a + b) + a = 3a + 3b + a = 4a + 3b
You remember that 'sum' means addition so that's b+11
it's: a + b