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D( x )
(7-(6*x))^2 = 0
(7-(6*x))^2 = 0
(7-(6*x))^2 = 0
(7-6*x)^2 = 0
7-6*x = 0 // - 7
-6*x = -7 // : -6
x = -7/(-6)
x = 7/6
x in (-oo:7/6) U (7/6:+oo)
71/((7-(6*x))^2) = 0
71/((7-6*x)^2) = 0
71 = 0
x belongs to the empty set
x belongs to the empty set
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