$\lim_{x\to0}\:x^3-2x^2+3x-1$
$a+3a-11a+6+4a-4$
$-6-6\cdot3$
$-3x^3y^5z^7-8x^5y^7z^4$
$0=3x^2-12x-15$
$2x^2-x-12\le9$
$8x^2-8x-6$
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