$\left(3x^4+7x^3+9x^2-x-6\right)$
$6x^2y-20x^2y+5x^2y$
$\frac{32x-20}{\left(x-1\right)\left(5x-3\right)}$
$3x^5.2x$
$-n^2+100n+1$
$15x+23>13x+22$
$\lim_{t\to\infty}\left(\frac{\sqrt{t}+t^2}{2t-t^2}\right)$
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