$$\frac { 4 } { 9 } q + 4 = 18$$
$q = \frac{63}{2} = 31\frac{1}{2} = 31.5$
$$\frac{4}{9}q=18-4$$
$$\frac{4}{9}q=14$$
$$q=14\times \frac{9}{4}$$
$$q=\frac{14\times 9}{4}$$
$$q=\frac{126}{4}$$
$$q=\frac{63}{2}$$
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