$$3x \div 6=C$$
$C=\frac{x}{2}$
$$\frac{1}{2}x=C$$
$$C=\frac{1}{2}x$$
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$x=2C$
$$\frac{\frac{1}{2}x}{\frac{1}{2}}=\frac{C}{\frac{1}{2}}$$
$$x=\frac{C}{\frac{1}{2}}$$
$$x=2C$$
