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Tercero : x
Segundo: x/5
Primero : x+6
=> Los tres suman 72 :
x+x+6+x/5 =72
2x+6+x/5 =72
10x+30+x=72*5
11x+30=360
11x=360-30
11x=330
x=30
∵ Hallamos los números :
Tercero : x+6 = 30+6 =36
Segundo: x/5 = 30/5 =6
Espero te sirva !! ·^^