$\lim_{x\to+\infty}\left(x^5-x^6+\sqrt{x}\right)$
$y=7x^{-2}$
$\left(x^2-2x-1\right)^3$
$-9n+12n+7$
$37-x<35$
$15x+7=\frac{2}{x}$
$\left(2y+x\right)\left(2y-x\right)+\left(x+y\right)^2-x\left(y+3\right)$
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