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p in (-oo:+oo)
6 = (3/4)*p // - (3/4)*p
6-((3/4)*p) = 0
(-3/4)*p+6 = 0
6-3/4*p = 0 // - 6
-3/4*p = -6 // : -3/4
p = -6/(-3/4)
p = 8
p = 8
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