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pero ns indican que:
1º a/4=c
2º b/9=d
luego:
c-d=3
4c+9d=64
9(c-d=3).............sistema de ecuaciones
se simplifican los 9d
13c=91
c=7
d=4
reeplazamos:
a=4c........a=28
b=9d........b=36
espero k t siva........