$15x^2\:-\:11x\:+\:2$
$3x-5\le0$
$z^2-12z+20$
$\left(-7x-7\right)-\left(2x+3\right)$
$\sin\left(a\right)\left(1+\tan\left(a\right)\right)=\tan\left(a\right)$
$\left(5x+13\right)\:exp\left(9x\right)$
$-18-\left(-21\right)$
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