$$0.12 x + \frac { ( 0.5 + x ) } { 2 } = \frac { x } { 3 } + 1.5$$
$x = \frac{375}{86} = 4\frac{31}{86} \approx 4.360465116$
$$0.72x+3\left(0.5+x\right)=2x+9$$
$$0.72x+1.5+3x=2x+9$$
$$3.72x+1.5=2x+9$$
$$3.72x+1.5-2x=9$$
$$1.72x+1.5=9$$
$$1.72x=9-1.5$$
$$1.72x=7.5$$
$$x=\frac{7.5}{1.72}$$
$$x=\frac{750}{172}$$
$$x=\frac{375}{86}$$
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