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p in (-oo:+oo)
15.6/4 = p/2 // - p/2
15.6/4-(p/2) = 0
3.9-1/2*p = 0 // - 3.9
-1/2*p = -3.9 // : -1/2
p = -3.9/(-1/2)
p = 7.8
p = 7.8
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