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p in (-oo:+oo)
-7 = (1/5)*p-1 // - (1/5)*p-1
1-((1/5)*p)-7 = 0
(-1/5)*p-7+1 = 0
-1/5*p-6 = 0 // + 6
-1/5*p = 6 // : -1/5
p = 6/(-1/5)
p = -30
p = -30
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