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D( x )
60-(2*x) = 0
60-(2*x) = 0
60-(2*x) = 0
60-2*x = 0
60-2*x = 0 // - 60
-2*x = -60 // : -2
x = -60/(-2)
x = 30
x in (-oo:30) U (30:+oo)
(30-x)/(60-(2*x)) = 0
(30-x)/(60-2*x) = 0
30-x = 0 // - 30
-x = -30 // * -1
x = 30
x in { 30}
x belongs to the empty set
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