$\cot^{-1}\left(\frac{630}{2070}\right)$
$28x-4->-12x-18$
$\frac{x^2+x-6}{x^2-6x+8}$
$12-x<8$
$\frac{5-8x\left(\frac{-1}{2}\right)}{3}$
$7\cdot50m$
$-4\left(4-2+5\right)-1-7$
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