Đáp án đúng: D
Giải chi tiết:\(\begin{array}{l}\,\,\,\,\,\,\,\,\,3\left( {2 - x} \right) + 5\left( {x - 6} \right)\,\,\,\,\,\,\,\,\,\, = - 98\\\,\,\,\,\,\,\,\,\,\left( {3.2 - 3.x} \right) + \left( {5.x - 5.6} \right) = - 98\\\,\,\,\,\,\,\,\,\,\left( {6 - 3x} \right) + \left( {5x - 30} \right)\,\,\,\,\,\,\,\,\,\,\, = - 98\\\,\,\,\,\,\,\,\,\,\,6 - 3x + 5x - 30\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = - 98\\\,\,\,\,\,\,\,\,\,\,\left( { - 3x + 5x} \right) + \left( {6 - 30} \right)\,\,\,\,\,\,\, = - 98\\\,\,\,\,\,\,\,\,\,\,\,\,2x + \left( { - 24} \right)\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = - 98\\\,\,\,\,\,\,\,\,\,\,\,\,2x\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = \left( { - 98} \right) - \left( { - 24} \right)\\\,\,\,\,\,\,\,\,\,\,\,\,2x\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = - 98 + 24\\\,\,\,\,\,\,\,\,\,\,\,\,2x\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = - 74\\\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,x\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = - 37\end{array}\)
Vậy \(x = - 37.\)
Chọn D.
