Răspuns:
3telefoane+2leptopuri=30000lei
1leptop=2500+1 telefon
3telefoane+2telefoane+5000lei=30000lei
5telefoane=25000lei
1telefon=5000lei
1leptop=5000lei+2500lei
1leptop=7500lei
Explicație pas cu pas:
verificare:3telefoane+2leptopuri=30000lei
3×5000lei+2×7500lei=30000lei
15000lei+15000lei=30000lei
30000lei=30000lei
am raspuns corect :)