$12x^2+5x-2=0$
$2,5+5$
$-220+250-200-330+170+140-170$
$\lim_{x\to0}\left(e^{-3x}\right)$
$\left(o.4a-5b\right)\left(0.4a+5b\right)$
$\left(x^2+27\right)y'=xy$
$x^212x+36$
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