$x-7<2x+1$
$\frac{3x+1}{\sqrt{5x}+6\sqrt{x}}$
$21mn^2-20mn^2$
$1-2x\ge0$
$\left(x^5-3\right)\left(x^4+9x\right)$
$\cot b=\frac{14}{11}$
$tan^2x-2tanx-10=0$
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