El profesor se sorprenderá mucho al ver tu solución correcta😉
/ 2 \ 2 2 (y + 3)*\y - 3*y + 9/ - y *(y - 2) = (y + 6) - (y - 6)*(12 - y)
(y+3)*(y^2-3*y+9)-y^2*(y-2) = (y+6)^2-(y-6)*(12-y)
27 + y^3 - y^2*(y - 2) = (y+6)^2-(y-6)*(12-y)
27 + y^3 - y^3 + 2*y^2 = (y+6)^2-(y-6)*(12-y)
(y+3)*(y^2-3*y+9)-y^2*(y-2) = 36 + y^2 + 12*y - (y - 6)*(12 - y)
(y+3)*(y^2-3*y+9)-y^2*(y-2) = 36 + y^2 + 12*y + 72 + y^2 - 18*y
-81 + 6*y = 0
y = 81 / (6)