$-\:\left\{-2\:-\:\left[-3\:-\:\left(-5\right)\:+1\right]\:-18\right\}$
$\frac{3x+5}{3x^2+7x\:-20}$
$4\left(1.75y-3.5\right)+1.25y$
$3x+9>5$
$-\sqrt{16}+\sqrt{169}$
$\left(2x^2-1\right)\left(1+2x^2\right)$
$\frac{1-2\sin\left(x\right)^2}{1-\tan\left(x\right)^2}$
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