y + c /c c \ -----*|- + -----| c \y y + c/
((y + c)/c)*(c/y + c/(y + c))
/c c \ (c + y)*|- + -----| \y c + y/ ------------------- c
(c + y)*(c/y + c/(c + y))/c
/c c \ (c + y)*|- + -----| \y c + y/ ------------------- c
(c + y)*(c/y + c/(c + y))/c
c*y + c*(c + y) --------------- c*y
(c*y + c*(c + y))/(c*y)
/c c \ (c + y)*|- + -----| \y c + y/ ------------------- c
/1 1 \ (c + y)*|- + -----| \y c + y/
(c + y)*(1/y + 1/(c + y))