First, make an equation. We'll use *a* as our variable for the man's current age.

2a = a + 30

Here's our equation, and now we just have to solve from there.

2a = a + 30

2a - a = 30

a = 30

His current age is 30.

To check that, we plug it into our equation.

2*30 = 30 + 30

60 = 60

Yes, the man's current age is 30 years.