$2+\left(4-2\right)\cdot3$
$\left(\frac{2}{5}t+\frac{1}{5}\right)\left(\frac{1}{5}t-\frac{2}{5}\right)$
$18=13x+5$
$3\cdot\:e^n\cdot\:3^{-n}$
$10:\:5\:$
$\left(20x^2\:-9x+18x^3\right)\:-\:\left(12x^3-x+7x^2\right)$
$\left(-19\right)-\left(-23\right)$
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