$$-3x+1 < 3[(x+2)-2x]-1$$
$x\in \mathrm{R}$
$$-3x+1<3\left(-x+2\right)-1$$
$$-3x+1<-3x+6-1$$
$$-3x+1<-3x+5$$
$$-3x+1+3x<5$$
$$1<5$$
$$x\in \mathrm{R}$$
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