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[(x+780:6)x3+4]x5=1985

Răspuns :

[(x+780:6)x3+4]= 1985:5
[(x+780:6)x3+4]= 397
(x+780:6)x3= 397-4
(x+780:6)x3=393
x+780:6=393:3
x+780:6=131
x+ 130=131
x=1