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Substitute this into the first equation,\[60=v(\frac{56-8v}{4-v}) \rightarrow 240-60v=56v-8v^2\]

This is quadratic in v\[8v^2-116v+240=0\]

which can be factored as\[4(v-12)(2v-5)=0\rightarrow v=12,\frac{5}{2}\]

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