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p in (-oo:+oo)
15/16 = (7/4)*(p+p) // - (7/4)*(p+p)
15/16-((7/4)*(p+p)) = 0
(-7/4)*(p+p)+15/16 = 0
15/16-7/4*2*p = 0
(-7/4*2*16*p)/16+15/16 = 0
15-7/4*2*16*p = 0
15-56*p = 0
(15-56*p)/16 = 0
(15-56*p)/16 = 0 // * 16
15-56*p = 0
15-56*p = 0 // - 15
-56*p = -15 // : -56
p = -15/(-56)
p = 15/56
p = 15/56
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