Răspuns :
((x+260:2)*3+4)*5=1985
(x+130)*3+4=397
(x+130)*3=393
x+130=131
x=1
(x+130)*3+4=397
(x+130)*3=393
x+130=131
x=1
[(x+260:2)•3+4]•5=1985
(x+130)•3+4=1985:5
(x+130)•3+4=397
(x+130)•3=397-4
(x+130)•3=393
x+130=393:3
x+130=131
x=131-130
x=1
(x+130)•3+4=1985:5
(x+130)•3+4=397
(x+130)•3=397-4
(x+130)•3=393
x+130=393:3
x+130=131
x=131-130
x=1