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p in (-oo:+oo)
4*p+550/1 = 2*p-9 // - 2*p-9
4*p-(2*p)+550/1+9 = 0
4*p-2*p+9+550 = 0
2*p+559 = 0 // - 559
2*p = -559 // : 2
p = -559/2
p = -559/2
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