.
= 2.
Starting from the second store and up, the expression in the left side is the same
as starting from the first store up.
Therefore, we can replace the entire index, starting from the second store up, by 2,
based on the given equation.
Doing this way, we reduce our multi-store equation to this simple equivalent form
= 2,
which implies x = 2.
ANSWER. x = 2.
Solved.