[X-(1/5X+5)-(1/4x-7)]+(1/5X+5)+(1/5X+7)+1/8X=X

问题描述:

[X-(1/5X+5)-(1/4x-7)]+(1/5X+5)+(1/5X+7)+1/8X=X
最后答案等于X=40

X-(1/5X+5)-(1/4x-7)+(1/5X+5)+(1/5X+7)+1/8X=X
X-(1/4x-7)+(1/5X+7)+1/8X=X
(1/5X+7)-(1/4x-7)+1/8X=0
x=-560/3