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p in (-oo:+oo)
1.3 = p/(-7)-0.5 // - p/(-7)-0.5
0.5-(p/(-7))+1.3 = 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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