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4a kuadrat - 4a kuadrat = 9a +9-9
9a = 0
a = 0/9(?)
4a-6a-6a+9 = 4a+12a-3a-9
-8a+9=13a-9
-8a-13a= -9-9
21a= -18
a = -18/21
a = -6/7