Răspuns :

b-c=56
7/8*a=c
c=1/3*b
b/1-1/3*b=56
b/1-b/3=56
Amplificam b/1 cu 3:
3b/3-b/3=56
2b/3=56/1
Amplificam cu 3, 56/1
2b/3=168/3
2b=168
b=168:2
b=84
c=84:3
c=28
7/8*a=28
7a:8=28   /*8
7a=224
a=32

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