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p in (-oo:+oo)
9 = 4*p-(1/7) // - 4*p-(1/7)
1/7-(4*p)+9 = 0
1/7-4*p+9 = 0
64/7-4*p = 0 // - 64/7
-4*p = -64/7 // : -4
p = -64/7/(-4)
p = 16/7
p = 16/7
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