$-x^2+8x+1$
$\left(a^2\cdot b^3\right)^3$
$9x^2+30x-56=0$
$\sqrt{\frac{3}{0}}$
$\left(7x^2b+8y\right)\left(8y-7x^2\right)$
$\:c^6\cdot c^{-2}$
$18\cdot2a^2$
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