x/(3·x - 9) + (x - 1)/(6 - 2·x)
x/(3·(x - 3)) + (x - 1)/(2·(3 - x))
x/(3·(x - 3)) + (1 - x)/(2·(x - 3))
2·x/(6·(x - 3)) + 3·(1 - x)/(6·(x - 3))
(2·x + 3·(1 - x))/(6·(x - 3))
(2·x + 3 - 3·x)/(6·(x - 3))
(3 - x)/(6·(x - 3))
-(x - 3)/(6·(x - 3))
-1/6 für x ≠ 3
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