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p in (-oo:+oo)
(1/4)*p+(1/4)*p-(2*p)+4*p = -45 // + 45
(1/4)*p+(1/4)*p-(2*p)+4*p+45 = 0
(1/4)*p+(1/4)*p-2*p+4*p+45 = 0
5/2*p+45 = 0 // - 45
5/2*p = -45 // : 5/2
p = -45/5/2
p = -18
p = -18
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