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p in (-oo:+oo)
(4/1)*p+(2/5)*p = (1/2)*p-(9/20) // - (1/2)*p-(9/20)
(4/1)*p+(2/5)*p-((1/2)*p)+9/20 = 0
4*p+(2/5)*p+(-1/2)*p+9/20 = 0
39/10*p+9/20 = 0 // - 9/20
39/10*p = -9/20 // : 39/10
p = -9/20/39/10
p = -3/26
p = -3/26
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