$$2(-1)^{3}+(-1)^{2}-2(-1)-1$$
$0$
$$2\left(-1\right)+\left(-1\right)^{2}-2\left(-1\right)-1$$
$$-2+\left(-1\right)^{2}-2\left(-1\right)-1$$
$$-2+1-2\left(-1\right)-1$$
$$-1-2\left(-1\right)-1$$
$$-1-\left(-2\right)-1$$
$$-1+2-1$$
$$1-1$$
$$0$$
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