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p in (-oo:+oo)
(3/4)*(p+12) = (1/2)*(p-6) // - (1/2)*(p-6)
(3/4)*(p+12)-((1/2)*(p-6)) = 0
(3/4)*(p+12)+(-1/2)*(p-6) = 0
3/4*(p+12)-1/2*(p-6) = 0
3/4*(p+12)-1/2*(p-6) = 0
1/4*p+12 = 0
1/4*p+12 = 0
1/4*p+12 = 0 // - 12
1/4*p = -12 // : 1/4
p = -12/1/4
p = -48
p = -48
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