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p in (-oo:+oo)
(-3/7)*p = 5/12 // - 5/12
(-3/7)*p-(5/12) = 0
(-3/7)*p-5/12 = 0
-3/7*p-5/12 = 0 // + 5/12
-3/7*p = 5/12 // : -3/7
p = 5/12/(-3/7)
p = -35/36
p = -35/36
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