Long description
Start fraction 2 x to the fourth power minus 128 x over 20 + 7 x minus 3 x squared end fraction = start fraction 2 x left parenthesis x cubed minus 64 right parenthesis over left parenthesis 4 minus x right parenthesis left parenthesis 5 + 3 x right parenthesis end fraction = start fraction 2 x left parenthesis x minus 4 right parenthesis left parenthesis x squared + 4 x + 16 right parenthesis over minus left parenthesis x minus 4 right parenthesis left parenthesis 3 x + 5 right parenthesis end fraction, where x minus 4 is canceled from numerator and denominator of the fraction. minus start fraction 2 x left parenthesis x squared + 4 x + 16 right parenthesis over 3 x + 5 end fraction.
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