RPN+Calculator+Subtraction

As a user, I want to be able to subtract two numbers so that I don't have to do the work manually

UAT

 * [] 8 5 -> [3]
 * [] -3 -9 -> [6]
 * [] 4.2 2.3 -> [1.9]
 * [] 3 -> [-3]
 * [] -> [0]

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