b: \(=\dfrac{4x-12+14x+12-9x-27}{\left(x-3\right)\left(x+3\right)}=\dfrac{9}{x+3}\)
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b: \(=\dfrac{4x-12+14x+12-9x-27}{\left(x-3\right)\left(x+3\right)}=\dfrac{9}{x+3}\)