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p in (-oo:+oo)
p/2.3 = 4 // - 4
p/2.3-4 = 0
0.43478261*p-4 = 0 // + 4
0.43478261*p = 4 // : 0.43478261
p = 4/0.43478261
p = 9.19999997
p = 9.19999997
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