$6u^2-6-5u$
$3x^3-x^2-18x+6$
$\lim_{x\to3}\:\frac{27-x^3}{3-x}$
$a^4-4096$
$x-2x-\left(x+1\right)\:=\:7$
$-457-699$
$\left(-x^5\right)\left(3x\right)$
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