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D( p )
2*p = 0
2*p = 0
2*p = 0
2*p = 0 // : 2
p = 0
p in (-oo:0) U (0:+oo)
120/(2*p) = 30 // - 30
120/(2*p)-30 = 0
60*p^-1 = 30 // : 60
p^-1 = 1/2
-1 < 0
1/(p^1) = 1/2 // * p^1
1 = 1/2*p^1 // : 1/2
2 = p^1
p = 2
p = 2
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