The sum of a number and three is less than nineteen less the number

Answer: x < 8

Step-by-step explanation:

Let the number = x + 3 (sum) first sentience, continuation,

x + 3 < 19 - x, second sentience.

Now solve for x

Collect like terms

x + x < 19 - 3

2x < 16, divide through by 2

x < 8.