$2x^{-3}$
$7+7\left(7n-9\right)$
$x^2-8x-6$
$3\cos^2x+5\sin x=1$
$2x\cdot2x\cdot x$
$7x+4=8x-2$
$\frac{4x}{x-1}+2\ge0$
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