$xy-2y-y=0$
$x^2-10x+19=0$
$x\left(x-1\right)-5x\left(x-2\right)-2$
$x^2+\frac{3}{5}=-\frac{1}{25}$
$-6n+-12+4n$
$10x^2+x-21=0$
$\frac{d}{dx}5xy^7-y^3=9x+4y$
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