求1/(x+4)-1/(x+7)=1/(x+3)-1/(x+6)的值

问题描述:

求1/(x+4)-1/(x+7)=1/(x+3)-1/(x+6)的值

1/(x+3)-1/(x+4)=1/(x+6)-1/(x+7)
(x+6)(x+7)=(x+3)(x+4)
6x=-30
x=-5