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p in (-oo:+oo)
(12/15)*p-4 = (10/15)*p // - (10/15)*p
(12/15)*p-((10/15)*p)-4 = 0
(12/15)*p+(-2/3)*p-4 = 0
2/15*p-4 = 0 // + 4
2/15*p = 4 // : 2/15
p = 4/2/15
p = 30
p = 30
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