$30\cdot\left(-18\right)-18$
$\frac{4}{x^2}\le1$
$\left|-12\right|+\left|4\right|$
$-3\left(-1+2\right)$
$\left(3x^2-2xy\right)dx+\left(4y^2-x^2-3\right)dy=0$
$5\cdot2\cdot3^4$
$2\left(2\right)^{4}\left(-1\right)+\left(2\right)\left(-1\right)^{3}-8\left(2\right)^{2}\left(-1\right)$
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