Răspuns :
n - 324+489 - 273 = 222 | +273
n - 324+489-273+273=222+273 | +324
n +324-324+489=222+273+324 | -489
n +489-489 = 222+273+324-489
n = 330
n - 324+489-273+273=222+273 | +324
n +324-324+489=222+273+324 | -489
n +489-489 = 222+273+324-489
n = 330