$$0.5x+\frac{x}{3}=0.25x+7$$
$x=12$
$$1.5x+x=0.75x+21$$
$$2.5x=0.75x+21$$
$$2.5x-0.75x=21$$
$$1.75x=21$$
$$x=\frac{21}{1.75}$$
$$x=\frac{2100}{175}$$
$$x=12$$
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