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p in (-oo:+oo)
2.1 = p/0.7 // - p/0.7
2.1-(p/0.7) = 0
2.1-1.42857143*p = 0
2.1-1.42857143*p = 0 // - 2.1
-1.42857143*p = -2.1 // : -1.42857143
p = -2.1/(-1.42857143)
p = 1.47
p = 1.47
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