In a subtraction formula, add up the subtracted, subtracted and difference, and the result is 346. If the new formula is 26, what is the subtraction?

In a subtraction formula, add up the subtracted, subtracted and difference, and the result is 346. If the new formula is 26, what is the subtraction?

Subtracted = subtracted + difference
therefore
The sum of three numbers is equal to twice the subtracted number
The result is 346, so the subtracted is 346 △ 2 = 173
If the difference is 26, then the subtraction = 173-26 = 147