Răspuns :
Facem intai calculul din paranteza rotunda si ne da:
=3861-x+2001=3998
3861-x=3998-2001
3861-x=1997
x=3861-1997
x=1864
=3861-x+2001=3998
3861-x=3998-2001
3861-x=1997
x=3861-1997
x=1864
(2093+1768)-x= 3998-2001
= (2093 + 1768)- x = 1997
=3861-x=1997
×= 1997-3861= - 1864