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p in (-oo:+oo)
(1/2)*(12*p+9)-p+4 = 0
1/2*(12*p+9)-p+4 = 0
1/2*(12*p+9)-p+4 = 0
5*p+4+9/2 = 0
5*p+17/2 = 0
5*p+17/2 = 0
5*p+17/2 = 0 // - 17/2
5*p = -17/2 // : 5
p = -17/2/5
p = -17/10
p = -17/10
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