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p in (-oo:+oo)
(p+12)/2 = (8-(3*p))/4 // - (8-(3*p))/4
(p+12)/2-((8-(3*p))/4) = 0
(p+12)/2-((8-3*p)/4) = 0
(p+12)/2+(-1*(8-3*p))/4 = 0
(4*(p+12))/(2*4)+(-1*2*(8-3*p))/(2*4) = 0
4*(p+12)-1*2*(8-3*p) = 0
10*p+32 = 0
(10*p+32)/(2*4) = 0
(10*p+32)/(2*4) = 0 // * 2*4
10*p+32 = 0
10*p+32 = 0 // - 32
10*p = -32 // : 10
p = -32/10
p = -16/5
p = -16/5
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