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2014-10-18T12:06:39+03:00
A+b+c=47
a-x=b-x=c-x
a-x=6
b-x=2
c-x=12

a=x+6
b=x+2
c=x+12

3x+20=47
3x=27
x=9

a=15
b=11
c=21
2014-10-18T12:11:57+03:00
A+b+c=47
6+2+12=20
47-20=27
27:3=9
15-9=6
21-9=12
11-9=2

12+21+11=47