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p in (-oo:+oo)
8-((1/2)*p) = (3/2)*p-10 // - (3/2)*p-10
8-((1/2)*p)-((3/2)*p)+10 = 0
(-1/2)*p+(-3/2)*p+8+10 = 0
18-2*p = 0 // - 18
-2*p = -18 // : -2
p = -18/(-2)
p = 9
p = 9
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