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2014-04-26T01:37:59+03:00
F+b=33
f-5=(b+2)/2
2f-10=b+2
2f=b+2+10
f=b+12/2

b+12/2  +b=33
b+12 +2b+66
3b=66-12
3b=54
b=18
f=15
1 5 1