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9 - 9 = 0
5 -9 · ? = 1
5 - 9(4/9) = 1
0,5 + ? = 0
0,5 - 0,5 = 0
-3,5 . ? = 1
(-3 - 5/10) x = 1
(-30/10 - 5/10) x = 1
(-35/10) x = 1
x = -10/35