$\lim_{x\to1}\left(\frac{3x^2-2x-1}{x^2+2x-3}\right)$
$x+y=135$
$4x^216xy+7y^2$
$x^2-6<-5$
$3x^3+3\cdot\ln\left(x\right)-5$
$-\frac{\left[4x^{3\:}y^2\right]^4}{-4y^4.2y^3}$
$\frac{2x^3+x^2-x+3}{2x+3}$
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