$-68\:-\:74\:+\:90\:-\:43\:-\:17\:+\:30\:-\:12$
$\frac{30}{0.5}$
$17w\:=\:51$
$\int\frac{1}{x^{2}\sqrt{x^{2}+4}}dx$
$\left(x^4\right)^{-2}$
$3\left(2x+4y-15z\right)$
$3x+5<4x-2$
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