(5y^2 + 6y - 5)·[ 5y^2 + 6y - 5 - (y - 1)·(3y + 3) ] = [ (3y + 3)^2 ]·(y^2 + 2y - 2)(5y^2 + 6y - 5)·[ 5y^2 + 6y - 5 - (y - 1)·(3y + 3) ] = [ (3y + 3)^2 ]·(y^2 + 2y - 2)

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