(b/b²-9 - b/b²-6b+9)×(3-b)²/2b + 3/b+3=(b/(b-3)(b+3) - b/(b-3)²)×(3-b)²/2b + 3/3+b=b²-3b-b²-3b/(b-3)²(b+3)×(3-b)²/2b + 3/3+b=-3b/(b+3) + 3/b+3=3-3b/(b+3)
(b/b²-9 - b/b²-6b+9)×(3-b)²/2b + 3/b+3=(b/(b-3)(b+3) - b/(b-3)²)×(3-b)²/2b + 3/3+b=b²-3b-b²-3b/(b-3)²(b+3)×(3-b)²/2b + 3/3+b=-3b/(b+3) + 3/b+3=3-3b/(b+3)