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p in (-oo:+oo)
(1/4)*(p+4)+(3/5)*(p-1) = 0
1/4*(p+4)+3/5*(p-1) = 0
1/4*(p+4)+3/5*(p-1) = 0
17/20*p+2/5 = 0
17/20*p+2/5 = 0
17/20*p+2/5 = 0 // - 2/5
17/20*p = -2/5 // : 17/20
p = -2/5/17/20
p = -8/17
p = -8/17
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