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p in (-oo:+oo)
40-((1/3)*p) = (1/5)*p // - (1/5)*p
40-((1/3)*p)-((1/5)*p) = 0
(-1/3)*p+(-1/5)*p+40 = 0
40-8/15*p = 0 // - 40
-8/15*p = -40 // : -8/15
p = -40/(-8/15)
p = 75
p = 75
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