$\lim_{x\to2}\left(\frac{x^2-5x+6}{x^3+4x^2+5x-2}\right)$
$\left(-15\right)+\left(-20\right)-\left(-12\right)$
$2+-9+-2+8$
$xy'\:+\:7x^3y\:=\:x^3$
$\left(n\:-\:7\right)^3\:$
$60x+60=50x+90$
$\left(4x^4+7x^2y\right)\left(2x^2+9xy\right)$
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