$$3 \frac{ 1 }{ 3 } \div 5 \frac{ 5 }{ 7 } =2 \frac{ 4 }{ 5 } \div x$$
$x = \frac{24}{5} = 4\frac{4}{5} = 4.8$
$$\frac{7}{40}x\times \frac{3\times 3+1}{3}=\frac{2\times 5+4}{5}$$
$$\frac{7}{40}x\times \frac{9+1}{3}=\frac{2\times 5+4}{5}$$
$$\frac{7}{40}x\times \frac{10}{3}=\frac{2\times 5+4}{5}$$
$$\frac{7\times 10}{40\times 3}x=\frac{2\times 5+4}{5}$$
$$\frac{70}{120}x=\frac{2\times 5+4}{5}$$
$$\frac{7}{12}x=\frac{2\times 5+4}{5}$$
$$\frac{7}{12}x=\frac{10+4}{5}$$
$$\frac{7}{12}x=\frac{14}{5}$$
$$x=\frac{14}{5}\times \frac{12}{7}$$
$$x=\frac{14\times 12}{5\times 7}$$
$$x=\frac{168}{35}$$
$$x=\frac{24}{5}$$
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