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p in (-oo:+oo)
(3/4)*(8*p+7)-((7/16)*(4*p+5)) = 0
(3/4)*(8*p+7)+(-7/16)*(4*p+5) = 0
3/4*(8*p+7)-7/16*(4*p+5) = 0
3/4*(8*p+7)-7/16*(4*p+5) = 0
17/4*p+49/16 = 0
17/4*p+49/16 = 0
17/4*p+49/16 = 0 // - 49/16
17/4*p = -49/16 // : 17/4
p = -49/16/17/4
p = -49/68
p = -49/68
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