А²(а-3) - 36(а-3) / (а-3)(а+3) = (а²-36)(а-3) / (а-3)(а+3) = а²-36 / а+3
а²-36 / а+3 = 0
а²-36 = 0
а² 36
а = 6
а = -6
(5у-6)-(3-3у)(2у-3)-3(2у+3) / (2у-3)(2у+3)=0
(5у-6-6у+9+6у²-9у-6у-9) / (2у-3)(2у+3) = 0
6у²-16у-6 / (2у-3)(2у+3) = 0
6у²-16у-6 = 0
3у²-8у-3 = 0
Д = 64-4(-3)*3 = 64+36=100
у₁ = (8+10)/6 = 3
у₂+(8-10)/6 = - 2/6 = - 1/3