$$15/9x \times 12=S1$$
$S_{1}=20x$
$$\frac{5}{3}x\times 12=S_{1}$$
$$20x=S_{1}$$
$$S_{1}=20x$$
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$x=\frac{S_{1}}{20}$
$$\frac{20x}{20}=\frac{S_{1}}{20}$$
$$x=\frac{S_{1}}{20}$$