1/X+1/3X+2=1/8
1/x+1/(3x+2)=1/8
[3x+2+x]/(3x+2)=1/8
[3x+2+x]/(3x+2)-1/8=0
[8(4x+2)-(3x+2)]/8(3x+2)=0
(29x+14)/8(3x+2)=0
所以 29x+14=0
得 x=-14/29