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a/28=(a+20)/63
63a=28a+560
35a=560
a=16
56/48=(b+56)/(30+48)
48b+2688=4368
b=1680/48=35
21/18=(x+21)/(12+18)
18x+378=630
x=252/18=14
21/18=(c+x+21)/(18+12+36)
21/18=(c+35)/66
18c+630=1386
c=756/18=42