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Apps [Q] Force Closed When Subtracting

For some reason my program closes when this command is ran.

let a represent 50
let b represet 32
yes i already have variables set up.

Code:
textOutcome.setText(50 - 32);

Everythine is imported and varables are set. but it force closes on that command and im 100% sure of it.

Can Any one atleast solve this issue?
 
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