$xy'\:=\:-x-y$
$6x^2+8x+20$
$\left(3+m^2\right)^2$
$32x-8$
$19a-6b+b-6a$
$\lim_{x\to0}\:\frac{2}{1-x^2}\:-\:\frac{1}{1+x}$
$-w^2-10w-25$
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