$-3\left(2x+3\right)\ge9$
$\frac{1}{1+\cot\left(x\right)^2}+\cos x^2$
$25x^2-200x+404$
$\frac{5x-4}{5}$
$x^2\:+\:4x\:-\:20$
$x^3-2x^2-9x+18$
$3x^2-36=0$
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