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p in (-oo:+oo)
(-1/4)*p = 1/18 // - 1/18
(-1/4)*p-(1/18) = 0
(-1/4)*p-1/18 = 0
-1/4*p-1/18 = 0 // + 1/18
-1/4*p = 1/18 // : -1/4
p = 1/18/(-1/4)
p = -2/9
p = -2/9
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