Răspuns :
X-980+1209-729=4507
×-980+1209=4507+729
×-980+1209=5236
×-980=5236-1209
×-980=4027
×=4027+980
×=5007
A-980+1209-729 egal 4507. deci A egal cu 4125.sper ca te am ajutat.