Question 152239
{{{7x^3-7x^2-x+1}}}=
{{{7x^2(x-1)-(x-1)}}}=
{{{(7x^2-1)(x-1)}}}=0
then x^2=1/7 or x=1
then solutions are {{{x=sqrt(1/7)}}},{{{x=-sqrt(1/7)}}}and x=1