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p in (-oo:+oo)
-p/1.5 = 7 // - 7
-p/1.5-7 = 0
-0.66666667*p-7 = 0 // + 7
-0.66666667*p = 7 // : -0.66666667
p = 7/(-0.66666667)
p = -10.49999995
p = -10.49999995
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