$$\frac { n } { 5 } - \frac { 5 } { 7 } = \frac { 2 } { 3 }$$
$n = \frac{145}{21} = 6\frac{19}{21} \approx 6.904761905$
$$21n-75=70$$
$$21n=70+75$$
$$21n=145$$
$$n=\frac{145}{21}$$
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