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$ echo 'x=y=1.2; x+=1.1; x-=1.1; x; y; x==y' |bc |xargs echo
1.2 1.2 1

$ perl -wle '$x=$y=1.2; $x+=1.1; $x-=1.1; $,=$"; print $x, $y, $x == $
+y'
1.2 1.2