Question 827135
Let p = amount of water initially in each tank.


3000 gallons pumped from one tank to the other.
Say, left tank has p+3000 gallons; right tank has p-3000 gallons.
Understand that {{{p+3000>p-3000}}}.


Left tank has six times the water that right tank has:
{{{highlight(p+3000=6(p-3000))}}};
If you understand all that, then you are now fine.  Solve for p.