(6a - 1)(6a + 1) = 4a ( 9a + 2) -1
36a^2 - 1 = 36a^2 + 8a -1
36a^2 - 36a^2 -1 + 1 -8a = 0
-8a = 0
a = 0
(6a-1)(6a+1)=4a(9a+2)-1
36a^2-1=36a^2+8a-1
36a^2-1-36a^2-8a+1=0
-8a=0
a=0
