The cost of the brownie is $2.50.
The cost of 2 scoops of ice cream is 2 * $1.00 = $2.00.
The cost of double syrup is 2 * $0.50 = $1.00.
The cost of nuts is x.
The total cost of Juanita's dessert is the sum of the cost of the brownie, the cost of the ice cream, the cost of the syrup, and the cost of the nuts: $2.50 + $2.00 + $1.00 + x.
We are given that the total cost is $7, so we can write: $2.50 + $2.00 + $1.00 + x = $7.
Simplifying the left side, we get: $5.50 + x = $7.
Subtracting $5.50 from both sides, we get: x = $1.50.
The value of x is $1.50.
#### 1.5
The answer is: 1.5
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
A local restaurant was offering a "Build Your Own Hot Brownie" dessert.  The brownie cost $2.50 and each scoop of ice cream costs $1.00.  Any syrup costs $0.50 and nuts cost x.  If Juanita orders the brownie with 2 scoops of ice cream, double syrup, and nuts, how much will her dessert cost?
If we know the answer to the above question is 7, what is the value of unknown variable x?

### Answer:
