$$\frac{ 7x }{ 30 } = \frac{ 1 }{ 10 }$$
$x=\frac{3}{7}\approx 0.428571429$
$$7x=\frac{1}{10}\times 30$$
$$7x=\frac{30}{10}$$
$$7x=3$$
$$x=\frac{3}{7}$$
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