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L=largo
a=ancho
P=2L+2a
L=2a-3
P=36
Solución
P=2L+2a
36=2(2a-3)+2a
36=4a-6+2a
36=6a-6
6a=36+6
6a=42
a=42/6
a=7
Largo
L=2a-3
L=2(7)-3
L=14-3
L=11
Las dimensiones son:
Ancho =7
Largo =11
Saludos.....