$-2.3\:\cdot6.8$
$7\cdot2^3-3\cdot2^2-2+10$
$6x^2+13x-5$
$\frac{x^4-6}{3x^3+4x^4}$
$\:\left(xy^2z^3\right)^{-1}\:\left(xyz\right)^3$
$\sqrt[3]{\left(\frac{3}{4x}\right)}$
$-180+25-\left(-23\right)+54$
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