Answer:
x - 13 = 22 ; x = 13+22, x = 25
Explanation:
Think of it like this: x would be the length of the board before 13 inches was cut off. So, it could be x - 13 = 22, then you'd add 13 to both sides, getting x = 13+22, which is equal to 25. The board was 25 inches before it was cut.