The number of smoking teens is x% of the class, which means there are (x/100)*300 = 3x students who smoke.
In a year, 70% of the smoking students are hospitalized from smoking-related complications.
This means that 30% of the smoking students have not been hospitalized.
The total number of smoking students who have not been hospitalized is (30/100)*3x = 0.3*3x = 0.9x.
We are given that the total number of smoking students who have not been hospitalized is 36, so we can write: 0.9x = 36.
Dividing both sides by 0.9, we get: x = 40.
The value of x is 40.
#### 40
The answer is: 40
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
In a class of 300 students, the number of smoking teens is x% of the class. In a year, 70% of the smoking students are hospitalized from smoking-related complications. Calculate the total number of smoking students from the class who have not been hospitalized from smoking-related complications.
If we know the answer to the above question is 36, what is the value of unknown variable x?

### Answer:
