$\frac{d^2}{dx^2}\left(9x^2+y^2\right)$
$\left(x-2\right)\left(2x-7\right)=9$
$0,5x^{pq+1}\:-\:\frac{1}{2}x^{pq+1}\:+\:6x^{pq+1}$
$2x^3+x^2-7x-6$
$c^2+6c+40$
$-5a+\left(-18\right)=22$
$\frac{8x^5+4x^3+3x^2+9x+16}{2x^3+x^2+3}$
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