x=nr cautat
[(x-28):6]+48=360
(x-28):6=360-48
(x-28):6=312
x-28=312*6
x-28=1872
x=1872+28
x=1900
(n-28)/6+48=360, (n-28)/6=312, numitor comun 6,
n-28=1872, n=1872+28=1900
