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How to process a digital signal in caculator

Let's say I have a signal k<19:0>,It's actually a fixed-point decimal,k<19> is its sign bits,k<18:15> is its integer bits,k<14:0> is its fractional bits,So mathematically The final expression is as follows
-(2^19)*k<19> + k<18:0>/(2^15),k<18:0> is its unsigned decimal number,k<19> just stands for 1 or 0. how to do that

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