$$\left. \begin{array} { l } { \quad ( 1 ) 4 x + 13 = 3 x + 15 } \end{array} \right.$$
$x=2$
$$4x+13=3x+15$$
$$4x+13-3x=15$$
$$x+13=15$$
$$x=15-13$$
$$x=2$$
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