$d^2-3d$
$250-\left(35\right)+20+\left(-15\right)$
$\ln\left(x\sqrt{x^2-8}\right)$
$\left(n-7\right)\left(n+6\right)$
$3x^4\left(2x^2-1\right)$
$\left(\frac{u-1}{2}\right)^2$
$50-400+800+63-8$
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