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p in (-oo:+oo)
3/4-(9*p) = -1/2 // + -1/2
3/4-(9*p)-(-1/2) = 0
3/4-9*p+1/2 = 0
5/4-9*p = 0 // - 5/4
-9*p = -5/4 // : -9
p = -5/4/(-9)
p = 5/36
p = 5/36
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