$\left(-4\right)-\left(+8\right)-\left(-6\right)$
$x^2+\frac{1}{4}x=0$
$a^4-2a^2+9$
$\frac{-15y^7\:z^6+9yz^6}{3y^5\:z^4}$
$-321+28$
$x^2+9x-5$
$\left(5t+7u\right)^0$
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