( 11/12 - y) * y = 1/6 -----> quadr. Gleichung lösen !
y² - 11/12 y+ 1/6 = 0
y1,2 = 11/24 ± √ 121 /576 - 96 / 576 = 11/24 ± √ 25 /576
y1,2 = 11/24 ± 5/24
y1 = 16/24 = 8 /12
y2 = 6/24 = 3/12 -----> Lösung !
x + 3/12 = 11/12
x = 8/12 !
x+y = 3/12 +8/12 = 11/12 und 3/12 * 8 /12 = 24 /144 = 1/6 !