d: \(=\dfrac{2x^2-12x+18+5x}{2\left(x-3\right)}:\dfrac{2x^2-7x+3+15}{x-3}\)
\(=\dfrac{2x^2-7x+18}{2\left(x-3\right)}\cdot\dfrac{x-3}{2x^2-7x+18}\)
\(=\dfrac{1}{2}\)
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