(18+b). Since b is an unknown variable, the equation can't be simplified any further.
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118
6 + 18 + 20 = 44
The sum of 18 and 15 is 33. 10+10=20 & 8+5=13. 20+13=33.
(b+5)
Assuming that a and b are two non-negative numbers, then their sum is a + b and the difference is |a - b|.