$0.25+-2$
$4\left(9x-4\right)$
$1610-321\:$
$-\left(2x-5\right)$
$6a^2+6a-12$
$\left(x+1\right)\cdot\left(c-1\right)$
$\frac{x\left[x\left(2x^2+3\right)+a\right]+b}{2x^2+2x+3}$
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