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a+b=2c
a-c=1/6b
c=a-1/6b
a+b=2(a-1/6b)
3a+3b=6a-b
4b=3a
b=3/4a
c=a-1/6.3/4a
c=a-1/8a
c=7/8a
a+b+c=21
a+3/4a+7/8a=21
8a+6a+7a=168
21a=168
a=8
b=3/4.8=6
c=7/8.8=7