$2x^2+20x=86$
$1dy-xdy-ydx=0$
$-x^2-7x-231$
$4.5-0.5\cdot3.8-4.2$
$\int7x^9dx$
$5+15+20y$
$+3-1-6-7+4-3-2+11+9+3-22$
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