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p in (-oo:+oo)
30 = (2/9)*p // - (2/9)*p
30-((2/9)*p) = 0
(-2/9)*p+30 = 0
30-2/9*p = 0 // - 30
-2/9*p = -30 // : -2/9
p = -30/(-2/9)
p = 135
p = 135
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