$$0.6x-0.3=1.2+0.4x$$
$x=7.5$
$$0.6x-0.3-0.4x=1.2$$
$$0.2x-0.3=1.2$$
$$0.2x=1.2+0.3$$
$$0.2x=1.5$$
$$x=\frac{1.5}{0.2}$$
$$x=\frac{15}{2}$$
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