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2014-02-11T20:54:07+02:00
A+b+c = 786
b=13 + a:2
b= c :4
13 + a:2 = c: 4
c=(13 + a:2 ) x 4
c= 52 + 2a 
a + 13 + a:2 + 52 + 2a =786 /x2
2a + 26 + a + 104 + 4a = 1572
7a + 130 = 1572
7a = 1442
a =1442 : 7 = 206
b = 13 + 206 : 2= 13 + 103 = 116
c = 52 + 412= 464
2 3 2