$2x\left(x-1\right)$
$2x\:-\:18\:=\:30$
$\frac{27-x^6y^3}{3+x^2y}$
$\frac{df}{dx}=120-3x$
$2\left\{3\:4\right\}+5\left\{6-3\right\}$
$tanx=1$
$1,4-0,5$
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