Perfect Simplicity

SAW this serial number on a Northern Line carriage yesterday: 51648.

As usual, each number should be used once, and once only, and must be added, subtracted, multiplied or divided to make a balanced equation.
What makes this Tube Puzzle unusual is that not only is there a perfect solution, ie one that uses the numbers in the order they appear, but the perfect solution is also the simplest solution.
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My solution: 5 + 1 + 6 = 4 + 8