Answer
$x^{3}$ - 2x$y^{2}$ + x - y - 7
Work Step by Step
$x^{3}$ + 2x$y^{2}$ - y + x - 4x$y^{2}$ - 7
= $x^{3}$ + (2x$y^{2}$ - 4x$y^{2}$) + x - y - 7
= $x^{3}$ - 2x$y^{2}$ + x - y - 7
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