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p in (-oo:+oo)
(1/2)*(p+4) = 6*p-9 // - 6*p-9
(1/2)*(p+4)-(6*p)+9 = 0
(1/2)*(p+4)-6*p+9 = 0
1/2*(p+4)-6*p+9 = 0
1/2*(p+4)-6*p+9 = 0
2-11/2*p+9 = 0
11-11/2*p = 0
11-11/2*p = 0
11-11/2*p = 0 // - 11
-11/2*p = -11 // : -11/2
p = -11/(-11/2)
p = 2
p = 2
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