9-4x +4x = 0+4x
Domain of x is 9/4
x^2 -8x = 0
x -8 =0
x -8+8 = 0
domain of x are 0, 8
x (x^2-13x +40) =0
x = 5
x = 8
Domain of x are 0, 5, and 8
the special values are correct, but the domain is all real numbers except those values.
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