Răspuns :
12540-a+144.200=155640
12540 - a +144200=155640
12540 - a= 11440
a=12540-11440
a= 1100
12540 - a +144200=155640
12540 - a= 11440
a=12540-11440
a= 1100
12540-a+144200=155640APOI FACI. 12540-a=155640-144200 =11440. a=12540-11440=1100