Respuesta :

3x2=x but no formula
[tex]90^{\circ}+2x^{\circ}+3x^{\circ}=180^{\circ} \\\\ 90+2x+3x=180 \ |-90\\\\ 5x=90 \ |:5 \\\\ x=18[/tex]

Answer: [tex]x=18[/tex]