$$0.6x+0.3=2.5-0.5x$$
$x=2$
$$0.6x+0.3+0.5x=2.5$$
$$1.1x+0.3=2.5$$
$$1.1x=2.5-0.3$$
$$1.1x=2.2$$
$$x=\frac{2.2}{1.1}$$
$$x=\frac{22}{11}$$
$$x=2$$
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