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b+c = 2
c+a = 3
---------------(+)
2a+2b+2c = 6
2(a+b+c) =6
a+b+c = 3
b+c=2
c+a=3
a+b=1
b=1-a
b=1-1
b=0
b+c=2
c=2-b
c=2-0
c=2
c+a=3
a=3-c
a=3-2
a=1
jadi
a+b+c=
1+0+2=3