$-6x+2\left(13-x\right)$
$\left(-0\right)\cdot\left(-11\right)$
$5x^2+3x-2x^2$
$\left(m^3-n^2\right)^2$
$\left(x^2-1\right)+\left(x^2-x-2\right)$
$\left(4x-2\right)\left(5x+3\right)$
$4x\:-\:2\:\left(-2x\right)$
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