Given that AB is not equal to 0, the square of a - the square of ab-2b = 0, then the value of 3a-b / 3A + B is

Given that AB is not equal to 0, the square of a - the square of ab-2b = 0, then the value of 3a-b / 3A + B is

Ab ≠ 0, then a ≠ 0, B ≠ 0
A & # 178; - ab-2b & # 178; = 0, (a-2b) (a + b) = 0, so a = 2B or a = - B
When a = 2B,
(3a-b)/(3a+b)=(6b-b)/(6b+b)=5/7
When a = - B,
(3a-b)/(3a+b)=-4b/-2b=2