$\frac{d^2}{dx^2}\left(x^5-2x^4+2x^2-7\right)$
$\frac{d^2}{dx^2}\left(\left(x^2-3\right)^6+10\right)^6$
$5f+10-4-f$
$\left(3ab-5x\right)\left(3ab+5x\right)$
$\left(4a^3-7a^2\right)^2$
$2\left(\frac{1}{4}x^2+25\right)$
$-2m+3n-6:3m-8n:-5m+24y+2z$
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