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[10(x+6)]+[5x]=225
10x+60+5x=225
15x+60=225
15x=225-60
15x=165
x=165/15
x=11
Se reemplaza x en la fórmula
[10(x+6)]+[5(x)]=225
Quedaría:
[10(11+6)]+[5(11)]=225
[10(17)]+[5(11)]=225
X=Numero de monedas que pide hallar