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D( p )
p-30 = 0
p-30 = 0
p-30 = 0
p-30 = 0 // + 30
p = 30
p in (-oo:30) U (30:+oo)
1 = p/(p-30) // - p/(p-30)
1-(p/(p-30)) = 0
(-1*p)/(p-30)+1 = 0
(-1*p)/(p-30)+(1*(p-30))/(p-30) = 0
1*(p-30)-1*p = 0
-30 = 0
-30/(p-30) = 0
-30/(p-30) = 0 // * p-30
-30 = 0
p belongs to the empty set
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