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2010-04-14T18:31:38+02:00
2a+2b = 40
a-5 = b+4

a = b + 9
2(b+9) + 2b = 40

a = b + 9
2b+18+2b = 40

a = b + 9
4b = 22

b=5,5
a = 5,5 + 9

a = 14,5
b = 5,5