解方程：x的2次方+x分之7+x的2次方-x分之1=x的2次方-1分之6

7/（x²+x)+1/(x²-x)=6/(x²-1)
7/[x(x+1)]+1/[x(x-1)]=6/[(x+1)(x-1)]
7(x-1)+(x+1)=6x
7x-7+x+1=6x
2x=6
x=3