当x取什么值时,式子x-x-1/3的值与7-x 3/5

问题描述:

当x取什么值时,式子x-x-1/3的值与7-x 3/5

如果题目是:
x- (x-1)/3 = (7- x)*(3/5)
则可以:
15x- 5(x-1) = 9(7-x)
15x -5x +5 = 63 -9x
4x = 43
x = 43/4