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-[-3a -(b+[a + 2a - b +a - b] +3b) +4a]
-[ -3a -b -a -2a +b -a +b +3b+4a]
-[ -3a -a -2a -a +4a -b +b +b +3b]
-[ -3a + 4b]
+ 3a - 4b