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p in (-oo:+oo)
-4 = (0.5*p)/7 // - (0.5*p)/7
-((0.5*p)/7)-4 = 0
-0.07142857*p-4 = 0
-0.07142857*p-4 = 0 // + 4
-0.07142857*p = 4 // : -0.07142857
p = 4/(-0.07142857)
p = -56.00000112
p = -56.00000112
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