$-25\:x-11\:\:+\:21x-3-12\:x-5\:\:-4x-3\:\:$
$\frac{y^4+12}{y+2}$
$\left(x+1\right)\left(x-2\right)\left(x-4\right)$
$\left(4mn-6m^2n\right)\left(mn\right)$
$421\cdot23$
$4-\left|-4\right|$
$\left(x^2yz^3\right)\left(-2xyz\right)$
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