P=\(\dfrac{2x-6}{x+3}-\dfrac{x+1}{2}=\dfrac{-15-x^2}{2\left(x+3\right)}\)
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P=\(\dfrac{2x-6}{x+3}-\dfrac{x+1}{2}=\dfrac{-15-x^2}{2\left(x+3\right)}\)