Răspuns :
12540-a+(4200+140000)=155640
12540-a+144200=155640
12540-a+144200=155640
156740-a=155640
a=156740-155640
a=1100
12540-a+144200=155640
12540-a+144200=155640
156740-a=155640
a=156740-155640
a=1100
12540 - a + (4200 + 140000) = 155640
12540 - a + 144200 = 155640
12540 - a = 155640 - 144200
12540 - a = 11440
a = 12540 - 11440
a = 1100
12540 - a + 144200 = 155640
12540 - a = 155640 - 144200
12540 - a = 11440
a = 12540 - 11440
a = 1100