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The range of a function is all values of y the function have.
So, looking at the elements (-7, 3), (-1, 6) and (8, -3), the y-coordinates of these points are 3, 6 and -3.
So the range of f(x) is:
[tex]\text{range}=\mleft\lbrace-3,3,6\mright\rbrace[/tex]