$$\frac{ x }{ 3 } - \frac{ 3 }{ 7 } = \frac{ 2 }{ 21 }$$
$x = \frac{11}{7} = 1\frac{4}{7} \approx 1.571428571$
$$7x-9=2$$
$$7x=2+9$$
$$7x=11$$
$$x=\frac{11}{7}$$
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