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D( X )
X-15 = 0
X-15 = 0
X-15 = 0
X-15 = 0 // + 15
X = 15
X in (-oo:15) U (15:+oo)
(20-(20*X))/(X-15) = 0
(20-20*X)/(X-15) = 0
20-20*X = 0 // - 20
-20*X = -20 // : -20
X = -20/(-20)
X = 1
X = 1
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