The sum of the digits of a two digit number is 1/5 of the difference between the number and the number obtained by interchanging the positions of the digits. What definitely is the difference between the digits of that number?

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What this question tests

Your ability to manipulate linear and quadratic expressions, substitute unknowns, and solve equations under time pressure.

Losing a sign when moving terms across the equals sign, or dividing both sides by a variable that could equal zero.