On the first day, Sol sells x candy bars.
On the second day, she sells x + 4 candy bars.
On the third day, she sells (x + 4) + 4 = x + 8 candy bars.
This pattern continues for six days, so on the sixth day, she sells x + 4 * 5 = x + 20 candy bars.
The total number of candy bars she sells in a week is the sum of the number of candy bars she sells each day: x + (x + 4) + (x + 8) + (x + 12) + (x + 16) + (x + 20) = 6x + 60.
If each candy bar costs 10 cents, then Sol earns 10 cents for each candy bar she sells.
To find out how much she earns in a week in dollars, we can multiply the total number of candy bars by 10 cents: (6x + 60) * 10 cents = (6x + 60) / 10 dollars = 0.6x + 6 dollars.
We are given that Sol earns 12 dollars in a week, so we can write: 0.6x + 6 = 12.
Solving for x, we get: 0.6x = 6.
Dividing both sides by 0.6, we get: x = 10.
The value of x is 10.
#### 10
The answer is: 10
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
Sol sells candy bars to raise money for her softball team. On the first day, she sells x candy bars and sells four more candy bars than she sold the previous day each day afterward. If she sells six days a week and each candy bar costs 10 cents, how much will she earn in a week in dollars?
If we know the answer to the above question is 12, what is the value of unknown variable x?

### Answer:
