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p in (-oo:+oo)
5/13 = p/18.2 // - p/18.2
5/13-(p/18.2) = 0
5/13-0.05494505*p = 0
5/13-0.05494505*p = 0 // - 5/13
-0.05494505*p = -5/13 // : -0.05494505
p = -5/13/(-0.05494505)
p = 7.00000055
p = 7.00000055
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