Решите уравнения (1-у)^3+8у=7+у^2(3-у)
(1-y)³+8y=7+y²(3-y)
1-3y+3y²-y³+8y = 7+3y²-y³
5y=7-1
5y=6
y=6/5 = 1 1/5