$\lim_{x\to3}\left(\frac{x^2-6x+9}{x^2+6x-27}\right)$
$\left(2x-1\right)\left(x+2.5\right)=0$
$x+8=x-5$
$343v^6-216y^{12}$
$\int\left(x-5\right)^{3}dx$
$\lim_{x\to\infty}\left(\frac{2-\sqrt{x-2}}{x^2-36}\right)$
$4x^2\:+\:6xy\:-\:3x\:+\:8yx\:-\:9x^2$
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