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2 bok x+7
3 bok x+5
x+x+7+x+5=30
3x=18
x=6
1bok = 6
2bok = 13
3bok=11
II bok - x+7
III bok - x+7-2=x+5
x+x+7+x+5=30
3x=30-5-7
3x=18
x=6 - I bok
x+7=6+7=13 - II bok
x+5=6+5=11 - III bok