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3×n+60-120/2+2-raiz de 4=120
3×n=120-60+120/2-2+raiz4
3×n=60+60-2+2
3×n=120-0
n=120/3
n=40
Comprobamos 3×40=120
triple de dinero= 3n
total de dinero de David= 120
3n=120
n= 120/3
n= 40
Juan tiene 40$