a:b=6 r 33
a-b=628
c=d×4-19
c+d=401
e=a+d
-----------
a:b=6 r 33
a=6b+33
6b+33-b=628
5b=585
b=585:5
b=117
-------------
a=628+117
a=745
---------------
e=745+117
e=862
-------------
4d-19+d=401
3d=420
d=420:3
d=140
-------------
c=401-140
c=261
Nota ! Atunci cand ai "3b", "6b" etc. înlocuiești asa :
3b |____|____|____|
6b |____|____|____|.