Răspuns :
(x:11-4):3-55=4/+55
(x:11-4):3=59/•3
x:11-4=177/+4
x:11=181
x=181•11
x=1991
(x÷11-4 )÷3-165:3=12÷3
(x :11- 4) :3-55-4=
(x-44):11]:3-59=
x-44=59×33
x=59×33+44
x=1991
(x :11- 4) :3-55-4=
(x-44):11]:3-59=
x-44=59×33
x=59×33+44
x=1991