$-2x^2-8x-5$
$\left(-6m^{-3}n^4c\right)^{-2}$
$\left(-x+2\right)\left(2-x\right)$
$\left(3x^2-5x+6\right)-\left(3x^2+3x+1\right)$
$2x.4.x^3.y^4.2xy$
$1.5r-3r+8r-2.5r$
$5\cdot\left(-21\right)\cdot8$
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