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D( x )
6*x-7 = 0
6*x-7 = 0
6*x-7 = 0
6*x-7 = 0 // + 7
6*x = 7 // : 6
x = 7/6
x in (-oo:7/6) U (7/6:+oo)
5-(5/(6*x-7)) = 5 // - 5
5-(5/(6*x-7))-5 = 0
5-5*(6*x-7)^-1-5 = 0
5-5/(6*x-7)-5 = 0
(-5*(6*x-7))/(6*x-7)-5/(6*x-7)+(5*(6*x-7))/(6*x-7) = 0
5*(6*x-7)-5*(6*x-7)-5 = 0
30*x-30*x-35+30 = 0
-5 = 0
-5/(6*x-7) = 0
-5/(6*x-7) = 0 // * 6*x-7
-5 = 0
x belongs to the empty set
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