Jesse first builds a building with 80 building blocks.
He then builds a farmhouse with 123 building blocks.
He adds a fenced-in area next to the farm made of 57 building blocks.
The total number of building blocks used is the sum of the building blocks used for the building, the farmhouse, and the fenced-in area: 80 + 123 + 57 = 260.
We are given that Jesse has x building blocks left, so we can write: 260 + x = 344.
Solving for x, we get: x = 84.
The value of x is 84.
#### 84
The answer is: 84
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
Jesse is playing with a pile of building blocks. He first builds a building with 80 building blocks. Then he builds a farmhouse with 123 building blocks. He adds a fenced-in area next to the farm made of 57 building blocks. If Jesse has x building blocks left, how many building blocks did he start with?
If we know the answer to the above question is 344, what is the value of unknown variable x?

### Answer:
