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p in (-oo:+oo)
(-21/1)*p = -3 // + 3
(-21/1)*p+3 = 0
3-21*p = 0
3-21*p = 0 // - 3
-21*p = -3 // : -21
p = -3/(-21)
p = 1/7
p = 1/7
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