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p in (-oo:+oo)
(16*p)/7 = (2*p-7)/4 // - (2*p-7)/4
(16*p)/7-((2*p-7)/4) = 0
(-1*(2*p-7))/4+(16*p)/7 = 0
(-1*7*(2*p-7))/(4*7)+(4*16*p)/(4*7) = 0
4*16*p-1*7*(2*p-7) = 0
50*p+49 = 0
(50*p+49)/(4*7) = 0
(50*p+49)/(4*7) = 0 // * 4*7
50*p+49 = 0
50*p+49 = 0 // - 49
50*p = -49 // : 50
p = -49/50
p = -49/50
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