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grupa 2 = x+5
grupa 3 = o,5x
x+x+5 + 1/2x = 25
5/2x = 20 /* 2/5
x = 8 <--- grupa 1 x+5 = 8+5 = 13 <--- grupa 2 1/2x = 1/2*8 = 8/2=4 = grupa 3
8+13+4=25