Question

(6a-1)(6a+1)-4a(9a+2)=-1

Answer 1

В ответе получаем 0.

Answer 2

(6a-1)(6a+1)-4a(9a+2)=-136а²+6а-6а-1-36а²-8а=-1
-1-8а=-1
-8а=-1+1
-8а=0
а=0:(-8)
а=0