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p in (-oo:+oo)
(15*p-8)/2 = 6*p+5 // - 6*p+5
(15*p-8)/2-(6*p)-5 = 0
(15*p-8)/2-6*p-5 = 0
(15*p-8)/2+(-6*2*p)/2+(-5*2)/2 = 0
15*p-6*2*p-5*2-8 = 0
3*p-10-8 = 0
3*p-18 = 0
(3*p-18)/2 = 0
(3*p-18)/2 = 0 // * 2
3*p-18 = 0
3*p-18 = 0 // + 18
3*p = 18 // : 3
p = 18/3
p = 6
p = 6
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