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p in (-oo:+oo)
(1*p)/2 = 30 // - 30
(1*p)/2-30 = 0
p/2-30 = 0
1/2*p-30 = 0 // + 30
1/2*p = 30 // : 1/2
p = 30/1/2
p = 60
p = 60
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