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p in (-oo:+oo)
(1/7)*(14-(6.5*p)) = 0
(1/7)*(14-6.5*p) = 0
1/7*(14-6.5*p) = 0
( 1/7 )
1/7 = 0
p belongs to the empty set
( 14-6.5*p )
14-6.5*p = 0 // - 14
-6.5*p = -14 // : -6.5
p = -14/(-6.5)
p = 2.15384615
p = 2.15384615
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