$$( - 7 x - y ^ { 3 } ) + ( - 5 x ^ { 4 } + y ^ { 3 } + 8 x )$$
$x-5x^{4}$
$$-7x-5x^{4}+8x$$
$$x-5x^{4}$$
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$x\left(1-5x^{3}\right)$
$$-5x^{4}+x$$
$$x\left(-5x^{3}+1\right)$$
