[tex]a \times 7 = b \times 8 = k \\ a = \frac{k}{7} \\ \\ b = \frac{k}{8} \\ \\ = > \frac{14k}{7} + \frac{8k}{8} = \frac{168}{1} \\ [/tex]
[tex]112k + 56k = 9408 \\ 168k = 9408 \\ k = 56[/tex]
[tex]a = \frac{k}{7} = \frac{56}{7} = > a = 8 \\ \\ b = \frac{k}{8} = \frac{56}{8} = > b = 7[/tex]
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