If the equation with the sign of four absolute values is |||||||||||x-1 |- 2 |- 3 |- 4 | = 0, then its root is

If the equation with the sign of four absolute values is |||||||||||x-1 |- 2 |- 3 |- 4 | = 0, then its root is

Remove the sign of the outermost absolute value
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