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p in (-oo:+oo)
p/(-7)-0.5 = 1.3 // - 1.3
p/(-7)-1.3-0.5 = 0
-1/7*p-1.8 = 0 // + 1.8
-1/7*p = 1.8 // : -1/7
p = 1.8/(-1/7)
p = -12.60000025
p = -12.60000025
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