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p in (-oo:+oo)
25 = (5*p)/4 // - (5*p)/4
25-((5*p)/4) = 0
(-5/4)*p+25 = 0
25-5/4*p = 0 // - 25
-5/4*p = -25 // : -5/4
p = -25/(-5/4)
p = 20
p = 20
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