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p in (-oo:+oo)
p/9 = 0.9 // - 0.9
p/9-0.9 = 0
1/9*p-0.9 = 0 // + 0.9
1/9*p = 0.9 // : 1/9
p = 0.9/1/9
p = 8.10000008
p = 8.10000008
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