$-\frac{27xy^2}{36yz}$
$65-\left(-4\right)\cdot\left(-12\right)+\left(-7\right)\cdot\left(-4\right)$
$\frac{2x}{5}-6=4$
$\left(-7+2\right)\left(-3\right)+\left[5-\frac{\left(-8\right)}{\left(+2\right)+\left(-4\right)}\right]+\frac{\left(-9\right)}{\left(+3\right)}$
$x^{12}-y^{14}$
$x+3>-5$
$7x^2-9=2x$
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