$9r^2-4r+1$
$3a-8b+7c-9a-2b-10c$
$2y-3xy-8y^{2}-15x^{2}+22xy$
$x^3\frac{dy}{dx}+3x^2y=x$
$b\left(x+1\right)-a\left(x+1\right)-x-1$
$\left(7^k-4^e\right)\left(4^e+7^k\right)$
$\frac{dy}{dx}\left(ln\:y\:cos\:x\:=\:x^3+2xy\:+1\right)$
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