$x+2y+3z=-2$
$2x+4-6x$
$\lim_{x\to\frac{\pi}{2}}\left(5e^{\tan\left(x\right)}\right)$
$\sqrt{1+x^{3}}$
$-18:6-35\left(-7\right)+\left(-11\right)$
$2xy-x-y,\:x=-2,\:y=2$
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