Răspuns :
286 + 98 = 286 + 98
384 = 384
92 + 82 - 54 = 174 - 54 = 120
120 = x + 49
x = 120 - 49
x = 71
verificare
120 = 71 + 49
120 = 120
384 = 384
92 + 82 - 54 = 174 - 54 = 120
120 = x + 49
x = 120 - 49
x = 71
verificare
120 = 71 + 49
120 = 120