Respuesta :


[tex]63 + x + 13 = 3x \\ 63 + x + 13 - 3x = 0 \\ combine \: like \: terms \\ - 2x + 76 = 0 \\ - 2x = - 76 \\ \frac{ - 2x}{ - 2} = \frac{ - 76}{ - 2} \\ x = 38[/tex]