$1-7b-5+4b-3b-5$
$-5y^2+-2y^2$
$4loga+5logb+logc$
$\frac{1}{3}-\frac{4x+24}{3x^2}=\frac{x^2-2x-8}{x^2}$
$\lim_{x\to2}x^{2.5}$
$-8y^3-y^3+12y^3+7y^3$
$\frac{dy}{dx}\left(xe^{tanx}\right)$
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