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despejando:
b=9a/5
c=3a/5
8+b+c= 85
reemplazando.
8+9a/5+3a/5=85
(40+9a+3a)/5=85
40+12a=425
12a=385
a=385/12
b=9a/5 = 9*385/(5*12)=693/12
c=3a/5 = 3*385/(5*12) = 231/12
Hallar el valor de (a+b-c),
385/12+693/12-231/12=847/12
Rta.847/12