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2014-05-26T15:57:00+03:00
X + x/2 + 2x = 140
2x +x + 4x = 140 *2
7x = 140*2
x = (140*2) / 7
x = 20*2
x = 40

1 5 1
2014-05-26T15:58:20+03:00
X+x:2+x:4=140
3x:2:4=140
3x:2=140x4
3x:2=560
3x=560x2
3x=1120
x=1120:3
x=373,(3)