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Despejando c
2d/10=c 7+35=42
42=42
c=d/5 ⇔ reemplazo en c+d=42
d/5+d/1=42
6d/5=42
6d=210
d=210/6; d=35 Respuesta
c=d/5
c=35/5 ; c=7 Respuesta