$x-2y+3z=1$
$10-\sqrt{3x+1}=0$
$fac\frac{2x^2-x-3}{x+1}$
$\frac{n^2}{n+1}$
$-x+2-y+4x-4+7y$
$8\cdot2.5$
$-3x^2-7-3x^2+2y^2-8x^2+9xy$
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