ohlanana 286/y = 13
y=286/13
y=22
y+15/6 = 12
y=12-15/6  (15/6=2.5)
y=12-2.5
y=9.5

sacha449 286/y=13
y=286/13
y=22

y+15/6=12
y+5/2=12
y=12-5/2=(24-5)/2
y=19/2=9  1/2