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p in (-oo:+oo)
(-21/2)*p = 3 // - 3
(-21/2)*p-3 = 0
-21/2*p-3 = 0 // + 3
-21/2*p = 3 // : -21/2
p = 3/(-21/2)
p = -2/7
p = -2/7
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