$\lim_{x\to5}\left(\frac{x^2-25}{5-x}\right)$
$3x+5y=15$
$2\left(w\:-\:6\right)\:=\:2w\:-\:12\:\cdot$
$-2\cdot\left|-\left(3+5\right)-2\cdot\left(4-1+3\right)\right|$
$-25-36x^4$
$\left(x^2-3e\right)^2$
$\left(2x-3\right)\left(2x+3\right)+\left(4x-5\right)^2-5\left(2x-4\right)$
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