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2014-09-24T09:04:06+03:00
A+b+b+c+c+a= 2a+ 2b+2c
2a+ 2b +2c = (90+ 21+ 75) =186
186 ÷ 2 = 93(a+b+c)
a= 93 -21= 72
c= 75-72 = 3
b= 21-3 = 18

2 5 2