0.3分之X减一减去0.5分之X加一等于1.2

(x - 1) / 0.3 - (x + 1) / 0.5 = 1.2
(x - 1) / (3/10) - (x + 1) / (5/10) = 1.2
(x - 1) X 10 / 3 - (x + 1) X 10 / 5 = 1.2
10 (x - 1) / 3 - (x + 1) X 2 = 1.2
3 X (10x - 10) / 3 - (2x + 2) X 3 = 1.2 X 3
10x - 10 - 6x - 6 = 3.6
4x - 16 = 0.9 X 4
x - 4 = 0.9
x = 4.9我有查到这题 是等于6.4但不知道过程怎么写 可以再想一下么？题目是：0.3分之（X-1）减去0.5分之（X+2）=1.2 刚才好像打错了。。。==(x - 1) / 0.3 - (x + 2) / 0.5 = 1.2(10x - 10) / 3 - (10x + 20) / 5 = 1.2(10x - 10) / 3 - (2x + 4) = 1.2(10x - 10) - (6x + 12) = 1.2 X 310x - 10 - 6x - 12 = 3.64x - 22 = 3.64x = 25.6x = 6.4