$\left(a^2+b^4\right)\left(a^2-b^4\right)$
$-n-90<30$
$x^2-3x-15$
$\lim_{x\to\infty}\left(9\cdot\:\frac{81-x^2}{\sqrt{x}-3}\right)$
$22^3-62^2+52+4$
$\left(-\frac{1}{4}x^3\right):\left(-\frac{3}{4}x\right)$
$\sqrt{-5x-6=x}$
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