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2014-02-26T19:10:30+02:00
A/b = 2/3
a - b = 15
3a = 2b
a = b + 15
3(b + 15) = 2b
3b + 45 = 2b
3b - 2b = - 45
b = -45
a = -45 + 15
a = -30
verificare : a -b = 15
-30 -(-45) = -30 + 45 = 15
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