$3a+2b-5c+7a-8b$
$64.85+29.38+18.45$
$1,09-9,129$
$\frac{4-\sqrt{a^2+7}}{3x+9}$
$24x^2-17x+1$
$\frac{d}{dx}\left(4e^{x-2}\right)$
$-220+250-200-330+170+140-170$
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