题目

解方程： 答案：解：3x+12−2=3x−210−2x+35去分母得，5(3x+1)−20=3x−2−2(2x+3)去括号得，15x+5−20=3x−2−4x−6移项得，15x−3x+4x=−2−6+20−5合并同类项得，16x=7解得x=71614、She may have missed the train, _______ she won’t arrive for another hour. A. in which            B. when              C. in which case            D. in that case