$\left(-4\right)\cdot\left(-5\right)-1$
$x^3-125$
$6\left(2x-1\right)+x+4$
$4x^2-2x+2$
$5x-7+3x\:\:3x-7+5x$
$\left(x-1\right)^2\left(2x-3\right)$
$-xz+x^2$
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