x-3x=9-2x=9x=-4.5~回答完毕~~结果仅供参考~~\(^o^)/~祝学习进步~~~
x-3x=9-2x=9x=-9/2(-4.5)
X - 3X = 9<=> -2X = 9<=> X = -(9/2) = -4.5
答案是 -4.5
答案是-4.5
