$x^2-8x+81=25$
$8x^2+52x+80$
$\frac{dy}{dx}=2x-1+y$
$xy'=x^3-2y$
$64x^2+48xy+9x^2$
$\frac{2x-1}{x-3}<1$
$y^2z^4\cdot4y^3z^6\cdot2yz^3$
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