$7\cdot3+49x^5-35x^7$
$\frac{d}{dx}t+ln|t|+c$
$75y+30xy+3x^2y$
$-76\cdot19$
$\left(2a^2-3b^2\right)^3$
$\frac{d}{dx}x-\sqrt{xy}+y\:=1$
$\frac{s^3-s+1}{s^2+s-2}$
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