$1^2-4x-21$
$4+8\left(x+3\right)\ge\:3\left(x-2\right)$
$-2.80-7.69$
$\frac{\sin x}{\sec x-\tan x}$
$log\:\left(x\right)\:+\:5\:log\:\left(y\right)\:-3\:log\:\left(z\right)$
$-0.001+1.7$
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