$17-\frac{\left(18-12\right)}{\left(-3\right)}$
$\:\frac{4\left(-5\right)+4}{12-3-1}$
$\frac{a^6-b^{12}}{a^2-b^2}$
$\left(x^2\:-\:2x\:\right)^2$
$3\left(0\right)+7$
$25x^2+653x-2340=0$
$\sqrt{\frac{x-1}{x^8+5}}$
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