$\lim_{x\to1}\left(\frac{x^3-x^2-x-1}{x^2-x}\right)$
$x\cdot5x\cdot6x$
$6x-2\left(3x+4\right)$
$\frac{-3}{4}x=-27$
$2x^2-4x-8-4x^2+5x-13$
$\:73\:y\:2\:\:-\:14\:y\:+\:7$
$\cos\left(2x\right)+3\cos\left(x\right)=-1$
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