$5x^4+7x^3-6x^4+11x^3$
$-2x^2+30x+20$
$\frac{2x^2+13x+15}{x+4}$
$1+5+-3+5+12+5+-17+5$
$\int\frac{1}{n}dn$
$y^2-4y=4y+16$
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