More Sharpening

SPOTTED this tricky - from a Tube Puzzle viewpoint - serial number on a London Overground train today.
38135
As usual, each number should be used once and once only, and must be added, subtracted, multiplied or divided to make a balanced equation.
I would classify this as "difficult."
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My solution:
8÷ (5 - 3) = 3 + 1