Know :$\displaystyle \left\{ \begin{array}{l} \log _a \left( b \right) = \frac{2}{3} \\ lug_c \left( d \right) = \frac{4}{5} \\ a - c = 9 \\ \end{array} \right. $ calculate :$\displaystyle b - d$ a,b,c,d naturels numbers.
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