$18\cdot\left(-73\right)\cdot\left(-10\right)$
$400x^6-900x^4y^6$
$2x^2-15x+25$
$\left(7u+8\right)-\left(4u+8\right)$
$2x^6-2y^3$
$x^3+x^2+x^1+x^{-3}+x^{-2}+x^{-1}+1$
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