$$\frac { f } { 3 } + \frac { 2 } { 6 } = \frac { 2 } { 9 } + 5 f$$
$f=\frac{1}{42}\approx 0.023809524$
$$6f+3\times 2=4+90f$$
$$6f+6=4+90f$$
$$6f+6-90f=4$$
$$-84f+6=4$$
$$-84f=4-6$$
$$-84f=-2$$
$$f=\frac{-2}{-84}$$
$$f=\frac{1}{42}$$
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