Răspuns :
1 800 = x + 13 000 - 14 500
x - 1 500 = 1 800
x = 1 800 + 1 500
x = 3 300
Verific: 3 300 + 13 000 - 14 500 = 16 300 - 14 500 = 1 800
x - 1 500 = 1 800
x = 1 800 + 1 500
x = 3 300
Verific: 3 300 + 13 000 - 14 500 = 16 300 - 14 500 = 1 800