$\lim_{x\to4\:}x^2-2x$
$2x^2-12x-14=0$
$\:\left(9x^2+3x+1\right)\left(3x-1\right)$
$\left(\left(x-2y\right)-2\right)^2$
$-35x^3-4x^2$
$-5r-4$
$-6y+17=3y-10$
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