$14x^{10}-21x^8$
$\frac{d}{dx}x^3+y^3=2xy+5$
$-4+3x-5^2+3x^2-7x+5$
$k+4k$
$\lim_{x\to\infty}\left(\left(\frac{1.25.x^2}{x^4+0.25\cdot x^2}\right)^2\right)$
$k2\:-\:81\:$
$-\frac{2}{7}\left(14x-21\right)$
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