$$1-(x-2)-[(x-3)-(x-1)]=0.$$
$x=5$
$$1-x-\left(-2\right)-\left(x-3-\left(x-1\right)\right)=0$$
$$1-x+2-\left(x-3-\left(x-1\right)\right)=0$$
$$3-x-\left(x-3-\left(x-1\right)\right)=0$$
$$3-x-\left(x-3-x-\left(-1\right)\right)=0$$
$$3-x-\left(x-3-x+1\right)=0$$
$$3-x-\left(-3+1\right)=0$$
$$3-x-\left(-2\right)=0$$
$$3-x+2=0$$
$$5-x=0$$
$$-x=-5$$
$$x=5$$
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