Pauline planted 3 kinds of tomatoes - x of each kind, which means she planted a total of 3x tomato plants.
She also planted 5 kinds of cucumbers - 4 of each kind, which means she planted a total of 5 * 4 = 20 cucumber plants.
In addition, she planted 30 potato plants.
The total number of plants she has in her garden is the sum of the tomato, cucumber, and potato plants: 3x + 20 + 30 = 3x + 50.
We are given that there are 10 rows with 15 spaces in each row to plant any vegetable, so the total number of spaces in the garden is 10 * 15 = 150.
To find out how many more vegetables Pauline could plant, we subtract the number of plants she already has from the total number of spaces: 150 - (3x + 50) = 100 - 3x.
We are given that Pauline could plant 85 more vegetables, so we can write: 100 - 3x = 85.
Solving for x, we get: x = 5.
The value of x is 5.
#### 5
The answer is: 5
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
Pauline has a garden with vegetables. In it, Pauline has planted 3 kinds of tomatoes - x of each kind, 5 kinds of cucumbers - 4 of each kind, and 30 potatoes. In the whole garden, there are 10 rows with 15 spaces in each to plant any vegetable. How many more vegetables could Pauline plant in her garden?
If we know the answer to the above question is 85, what is the value of unknown variable x?

### Answer:
