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9b^2 -6b-6b+4 - b^2-3b-3b+9=0
9b^2 - 12b+4 - b^2-6+9=0
8b^2-18b+13=0
lalu difaktorkn dn dicari akar persamaannya
9b^2-12b+4 - b^2-6b+9 =0
8b^2-18b+13=0