7: \(=\dfrac{x+7+x+x-7}{x\left(x+7\right)}=\dfrac{3x}{x\left(x+7\right)}=\dfrac{3}{x+7}\)
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7: \(=\dfrac{x+7+x+x-7}{x\left(x+7\right)}=\dfrac{3x}{x\left(x+7\right)}=\dfrac{3}{x+7}\)