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p in (-oo:+oo)
35 = (2/5)*(15*p-10) // - (2/5)*(15*p-10)
35-((2/5)*(15*p-10)) = 0
(-2/5)*(15*p-10)+35 = 0
35-2/5*(15*p-10) = 0
35-2/5*(15*p-10) = 0
39-6*p = 0
39-6*p = 0
39-6*p = 0 // - 39
-6*p = -39 // : -6
p = -39/(-6)
p = 13/2
p = 13/2
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