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p in (-oo:+oo)
(5/7)*p = -1/2 // + -1/2
(5/7)*p-(-1/2) = 0
(5/7)*p+1/2 = 0
5/7*p+1/2 = 0 // - 1/2
5/7*p = -1/2 // : 5/7
p = -1/2/5/7
p = -7/10
p = -7/10
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