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D( x )
7*x-14 = 0
7*x-14 = 0
7*x-14 = 0
7*x-14 = 0 // + 14
7*x = 14 // : 7
x = 14/7
x = 2
x in (-oo:2) U (2:+oo)
(2-x)/(7*x-14) = 0
2-x = 0 // - 2
-x = -2 // * -1
x = 2
x in { 2}
x belongs to the empty set
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