$\sqrt[x-1]{4x^3}+0x^2+x-2$
$\frac{1}{sec^2\left(a\right)-1}$
$21-3\frac{x}{9}=16$
$\frac{1}{1+x}<1$
$12.9-3.928$
$\frac{x^{-1}}{x^{-8}}$
$7x+8\:\:7x+6\:$
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