2x + 5 < 15
Subtracting 5 on both sides 2x + 5 – 5 < 15 – 5
2x < 10
Dividing by 2 on both the sides
\(\frac{2x}{2}\) < \(\frac{10}{2}\)
Since x is a natural number and it is less than 5, the solution is 4, 3, 2 and 1. It is shown in the number line as above.