Question

19,21-2,3; 51,64-9,16

Answer 1

19,21-2,3=16,91
51,64-9,16= 42.48

Answer 2

19,21-2,3=17,21-0,3=16,91
51,64-9,16=45,48
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Answer 3

It seems like you're providing a sequence of numbers and asking for some kind of clarification or calculation. However, the sequence you provided is not clear. Please provide more information or clarify your question so that I can assist you accurately.