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2014-11-13T17:47:09+02:00
A - 65 = 3b   ⇒ a = 3b + 65
a - b = 305
3b + 65 - b = 305
2b = 305 - 65
2b = 240
b = 240 : 2
b = 170
a = 3 * 170 + 65
a = 575
1 1 1