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p in (-oo:+oo)
(1/2)*(8*p+6)-p+3 = 0
1/2*(8*p+6)-p+3 = 0
1/2*(8*p+6)-p+3 = 0
3*p+3+3 = 0
3*p+6 = 0
3*p+6 = 0
3*p+6 = 0 // - 6
3*p = -6 // : 3
p = -6/3
p = -2
p = -2
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