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p in (-oo:+oo)
2*(4-((3/5)*p)) = 5 // - 5
2*(4-((3/5)*p))-5 = 0
2*((-3/5)*p+4)-5 = 0
2*(4-3/5*p)-5 = 0
2*(4-3/5*p)-5 = 0
3-6/5*p = 0
3-6/5*p = 0
3-6/5*p = 0 // - 3
-6/5*p = -3 // : -6/5
p = -3/(-6/5)
p = 5/2
p = 5/2
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