$3x^2+4y^2=2x$
$x^2\le10-3x$
$\frac{2}{3}x-\frac{1}{2}^2$
$c^2-3c+54$
$4x^2-4xy^2+y^4$
$\lim_{x\to\infty}\left(\frac{n}{x^{-1}}\right)$
$x^2-y^2=25$
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