Răspuns :
x=numarul
[(x*5)+50]:2-34=1
[(x*5)+50]:2=35
(x*5)+50=35*2
(x*5)+50=70
x*5=70-50
x*5=20
x=20:5
x=4
[(x*5)+50]:2-34=1
[(x*5)+50]:2=35
(x*5)+50=35*2
(x*5)+50=70
x*5=70-50
x*5=20
x=20:5
x=4