Question 889319
{{{2/(9t^8)-1/(6t^7)=2/(9t^8)-t/(6t^8)}}}
{{{2/(9t^8)-1/(6t^7)=4/(18t^8)-3t/(18t^8)}}}
{{{2/(9t^8)-1/(6t^7)=(4-3t)/(18t^8)}}}