(1/4X+X-1/5)=X-1/5--30
问题描述:
(1/4X+X-1/5)=X-1/5--30
答
(1/4X+X-1/5)=X-1/5-30
1/4X+X-1/5=X-1/5-30
1/4X=-30
所以X=-120