Răspuns:
a :100 :10 ×3 +396 =510
a :100 :10 ×3 =510 - 396
a :100 :10 ×3 =114
a :100 :10 =114 :3
a :100 :10 =38
a :100 =38 ×10
a :100 =380
a =380 ×100
a =38000
Verificare
38.000 :100 :10 ×3 +396 =510
380 :10 ×3 +396 =510
38 ×3 +396 =510
114 +396 =510
510 =510