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2014-07-02T17:50:44+03:00
2a+b=24
b=24-2a

2b+c=27
c=27-2b=27-2(24-2a)=  27-48+4a=  4a-21

2c+a=30
a=30-2c

a=30-2(4a-21)
a=30-8a+42
a=72-8a
a+8a=72
9a=72
a=8

b=24-2*8=24-16=8

c=4*8-21=32-21=11
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