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p in (-oo:+oo)
(1/2)*(p+6) = (7/2)*(3-p) // - (7/2)*(3-p)
(1/2)*(p+6)-((7/2)*(3-p)) = 0
(1/2)*(p+6)+(-7/2)*(3-p) = 0
1/2*(p+6)-7/2*(3-p) = 0
1/2*(p+6)-7/2*(3-p) = 0
4*p-15/2 = 0
4*p-15/2 = 0
4*p-15/2 = 0 // + 15/2
4*p = 15/2 // : 4
p = 15/2/4
p = 15/8
p = 15/8
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