To solve this problem, we need to determine the value of x, which represents the number on the calculator that Dean initially pressed the cube button on.
Let's break down the information given:
Number of participants: 42
Number on the calculator that Dean initially pressed the cube button on: x
Sum of the numbers showing on the calculators after one complete round: 0
We can set up the equation as follows:
(x^3) + (0^2) + (-1) = 0
x^3 - 1 = 0
To solve for x, we can use the fact that a^3 - b^3 = (a - b)(a^2 + ab + b^2). In this case, a = x and b = 1.
(x - 1)(x^2 + x + 1) = 0
Since the sum of the numbers showing on the calculators after one complete round is 0, we know that the equation must equal 0. Therefore, we have two possibilities:
x - 1 = 0 or x^2 + x + 1 = 0
If x - 1 = 0, then x = 1.
If x^2 + x + 1 = 0, then x is not a real number solution.

Therefore, the value of the unknown variable x is 1.
The answer is: 1
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
Dean is playing a game with calculators. The 42 participants (including Dean) sit in a circle, and Dean holds 3 calculators. One calculator reads 1, another 0, and the last one -1. Dean starts by pressing the cube button on the calculator that shows X, pressing the square button on the one that shows 0, and on the calculator that shows -1, he presses the negation button. After this, he passes all of the calculators to the next person in the circle. Each person presses the same buttons on the same calculators that Dean pressed and then passes them to the next person. Once the calculators have all gone around the circle and return to Dean so that everyone has had one turn, Dean adds up the numbers showing on the calculators. The sum he ends up with is 0. What is the value of unknown variable X?

### Answer:
