$\left(-2x^4+26x^2-72\right)$
$01\cdot7$
$4-3x\le-1-8x$
$\left(\frac{\sqrt{2}}{2}x+\frac{xy}{2}\right)^{2}$
$\frac{4}{5}=\frac{x-1}{x}$
$3x+2<5x-8$
$\frac{x}{9}=\:21$
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