$4x^2-6x+4\ge0$
$15mn-5m\cdot7mn+10mn\cdot5mn\:+3mn$
$2x^2+7x$
$v=\left(29.7-2x\right)\left(21.6-2x\right)x$
$\lim_{x\to2}\left(\frac{x^2-2x}{x^3+3x-2}\right)$
$-4286-2874$
$\left(\frac{x}{2}+\frac{y}{3}\right)\left(\frac{x}{2}+\frac{y}{3}\right)$
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