$$2 x + 9 = 13 - x$$
$x = \frac{4}{3} = 1\frac{1}{3} \approx 1.333333333$
$$2x+9+x=13$$
$$3x+9=13$$
$$3x=13-9$$
$$3x=4$$
$$x=\frac{4}{3}$$
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