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a=5-11b/3 ..... (1)
2a+4b=1
a=1-4b/2 ....(2)
Igualando (1) y (2)
5-11b/3 =1-4b/2
10-22b=3-12b
-10b=-7
b=7/10
Reemplazando el valor de b en:
2a+4b=1
2a+4(7/10)=1
2a+28/10=1
2a=-18/10
a=-18/20
a=-9/10