ajutor la b nu la a

Răspuns:
[tex]\bf\red\:b) \: 14 - 3x = 31 \\ \bf\red\: - 3x = 31 - 14 \\ \bf\red\: - 3x = 17 \\\bf\red\: x =17 \div ( - 3) \\ \bf\red\:x = - 17 \div 3 = > x = - \frac{17}{3} = - 5,(6)[/tex]