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Largo(L):2(5+2a)
2a+2(5+2a)=58
2a+10+2a=58
4a=58-10
a=48/4
a=12
2) Comprobamos.
2(12)+10+2(12)=58
24+10+24=58
58=58
R//
Ancho: 12 cm
Largo:17cm
Espero que sirva!Saludos!