means:



Use the distributive principle to remove the parentheses:



Six times five is thirty, so you put  in place of 



Subtract 30 from both sides:



Erase  since that is zero
Replace  with 



Divide both sides by 



Cancel the 's on the left and divide the  by the  on the right,
so replace  by :





That's the answer.  To check it, we substitute  for 
in the original equation:








Both sides are the same so we know the answer is correct.

Edwin