Đáp án đúng: D
Giải chi tiết:\(\begin{array}{l}3.x + 32 = 212\\3x\,\,\,\,\,\,\,\,\,\,\,\,\, = 212 - 32\\3x\,\,\,\,\,\,\,\,\,\,\,\,\, = 180\\\,\,\,x\,\,\,\,\,\,\,\,\,\,\,\,\, = 180:3\\\,\,\,x\,\,\,\,\,\,\,\,\,\,\,\,\, = 60\end{array}\)
Vậy \(x = 60.\)
Chọn D.