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5C+10D=195
5C=195-10D
C=195-10D/5=27
195-10D+5D/5=27
195-5D=5 (27)
195= 135+5D
195-135=5D
60=5D
60/5= D
12=D
RTA: Existen 12 monedas de 10 pesos y 15 monedas de 5 pesos.