Răspuns :
5086 - x -120 =1735
5086 - x=1735+120
5086- x =1855
x =5086 -1855
x=3231
VERIFICARE 5086-3213-120=1735
5086-x-120=1735
5086-x=1735+120
5086-x=1855
x=5086-1855
x=3231
Proba:
5086-3231-120=1735
5086-x=1735+120
5086-x=1855
x=5086-1855
x=3231
Proba:
5086-3231-120=1735