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a+c=2+2b
c-a=3b a+c+b=20
2+2b+b=20
b=6
a+b+c=20
a+6+c=20
a+c=14 c-a=3b
c-a=3(6)
c-a=18 +
a+c=14
2c=32 c=16 y a=-2