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3b(b-1)+2(b²-2b)/3-(b-b²)/3=
3b²-3b+(2b²-4b)/3-(b-b²)/3=(*3)
9b²-9b+3(2b²-4b)/3-3(b-b²)/3=
9b²-9b+2b²-4b-b+b²=
12b²-14b