Răspuns :
456-(5320-4997)-7a=90+1
456-323-7a=91
133-7a=91
-7a=91-133
-7a=-142
7a=142
a=142/7
456-323-7a=91
133-7a=91
-7a=91-133
-7a=-142
7a=142
a=142/7
456-(5320-4997)-7a=90+1
456-323-7a=91
133-7a=91
-7a=91-133
7a=142
a=142/7
Succes!!!!
456-323-7a=91
133-7a=91
-7a=91-133
7a=142
a=142/7
Succes!!!!