Question

$\frac{x}{y} = \frac{m}{n} \: \\ \\ \frac{x - y}{m - n} =$
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Answer 1

x/y = m/n

x = ym/n

(x - y)/(m - n) = (ym/n - y)/(m - n) = (ym - yn)/n : (m - n) = y/n(m - n) : (m - n) = y/n