First divide the complete equation by x².
then u will get,6x²-35x+62-35/x+6/x²=0
now put x+1/x=a----->eq.2
then squaring on both sides,
now sub. the values in eq.1
then by solving u will get two values of a.
than sub. the two values in eq.2 and u will get four values for 'x'.