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D( x )
7-(6*x) = 0
7-(6*x) = 0
7-(6*x) = 0
7-6*x = 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)
(5*x+2)/(7-(6*x)) = 0
(5*x+2)/(7-6*x) = 0
5*x+2 = 0 // - 2
5*x = -2 // : 5
x = -2/5
x = -2/5
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