Apply the formula: $a+\frac{b}{c}$$=\frac{b+ac}{c}$, where $a=7x$, $b=-8y\sqrt{x^2+1}dy$, $c=dx$, $a+b/c=7x+\frac{-8y\sqrt{x^2+1}dy}{dx}$ and $b/c=\frac{-8y\sqrt{x^2+1}dy}{dx}$
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