уравнение (y+1)*18=36+12*(y+1)
(y+1)*18=36+12*(y+1)
18y+18=36+12y+12
18y-12y=36+12-18
6y=30
y=30:6
у=5
18y+18=36+12y+12 18y-12y=36+12-18 6y=30 y=30/6 y=5