$-7x^2\cdot\left(3x^2+2xy\right)$
$65.45-23.546$
$\:\frac{x-2}{x^3-8}$
$49k^4-14k^2+1$
$y'+y=0,\:y\left(0\right)=2$
$\frac{8z^6x-15z^6x^7}{\:-4z^2+x^5}$
$\frac{16x^2y^2z}{4x^2y^2}$
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