$xy^'-y=y^3$
$w^2-14w+49$
$35x^4-21x^2$
$-5-1+6-8-3-7$
$y+9+7\left(y+7\right)$
$x^2+9x-36>0$
$\left(x-4\right)\cdot\left(x+4\right)^2$
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