1/(x^2+7x)-1/(x^2+7x)+1/(x^2+7X+18)-1/(x^2+7X+12)=0求X

问题描述:

1/(x^2+7x)-1/(x^2+7x)+1/(x^2+7X+18)-1/(x^2+7X+12)=0
求X

x=15