$5x^2-30x+15$
$8x^4-24x^3+32x^2$
$\:sequence\:$
$\left(7c^6-5m^5\right)^3$
$z^2-14z+49$
$\left(-5+12\right)-\left\{-3+\left[-5-\left(-4-6\right)\right]\right\}-\left[-6+\left(-4+7\right)\right]$
$\frac{3u}{u-1}+1$
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