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p in (-oo:+oo)
(1/5)*(15-(4*p))-((1/10)*(10*p+5)) = 0
(1/5)*(15-4*p)+(-1/10)*(10*p+5) = 0
1/5*(15-4*p)-1/10*(10*p+5) = 0
1/5*(15-4*p)-1/10*(10*p+5) = 0
5/2-9/5*p = 0
5/2-9/5*p = 0
5/2-9/5*p = 0 // - 5/2
-9/5*p = -5/2 // : -9/5
p = -5/2/(-9/5)
p = 25/18
p = 25/18
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