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a=7k y b=5k
a-b=30
7k-5k=30
2k=30
k=15
a=7k=7(15)=105... valor de a
b=5k=5(15)=75......valor de b
a=7/5b
a=30+b
igualamos las dos ecuaciones
(7/5)b=30+b
(7/5)b-b=30
((7-5)/5)b=30
(2/5)b=30
b= 30*5/2
b=150/5
b=75
reemplazamos en una de las ecuaciones y hallamos "a"
30+75=a
a=105.
valores
a=105
b=75