$-4x=-16$
$1.542^{\frac{1}{7}}$
$3\cos x+\sqrt{2}=0$
$\left(25x^9+9\right)\left(25x^9-8\right)$
$x^2+x+36$
$x^{2-2x+1}$
$\frac{x^2-7x+8}{x+5}$
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