$\left(-1\right)-\left(-1\right)^{-1}$
$x^3+18x^2+81x$
$-3\cdot\left(2\right)+5$
$4x^2+10x+6=0$
$2x^2-22x+48=0$
$m-5-5m+4$
$7x^2-x^2$
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