18 + n
the sum of 18 and a number equals 24
9x+10
3(x=12)
2(n+3)
3x+2
The sum is 32
6+n = 2n+5
14
"The sum of a number and three times another number is 18. find the numbers if their product is a maximum?"
18. The sum of its digits is 9. And yes, it is unique.
18
If: 9+x = 3 then x = -6