(五分之二X加四)加(五分之二X加四加二)等于X

问题描述:

(五分之二X加四)加(五分之二X加四加二)等于X
(2/5X+4)+(2/5X+4)=X

(2/5X+4)+(2/5X+4)=X
4/5X+8 =X
8 = X - 4/5X
8 = 1/5X
40 = X