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p in (-oo:+oo)
(3/4)*p = 3/10 // - 3/10
(3/4)*p-(3/10) = 0
(3/4)*p-3/10 = 0
3/4*p-3/10 = 0 // + 3/10
3/4*p = 3/10 // : 3/4
p = 3/10/3/4
p = 2/5
p = 2/5
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