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D( x )
7*x-7 = 0
3*x-3 = 0
7*x-7 = 0
7*x-7 = 0
7*x-7 = 0 // + 7
7*x = 7 // : 7
x = 7/7
x = 1
3*x-3 = 0
3*x-3 = 0
3*x-3 = 0 // + 3
3*x = 3 // : 3
x = 3/3
x = 1
x in (-oo:1) U (1:+oo)
4/(7*x-7) = 8/(3*x-3) // - 8/(3*x-3)
4/(7*x-7)-(8/(3*x-3)) = 0
4/(7*x-7)-8*(3*x-3)^-1 = 0
4/(7*x-7)-8/(3*x-3) = 0
(4*(3*x-3))/((7*x-7)*(3*x-3))+(-8*(7*x-7))/((7*x-7)*(3*x-3)) = 0
4*(3*x-3)-8*(7*x-7) = 0
44-44*x = 0
(44-44*x)/((7*x-7)*(3*x-3)) = 0
(44-44*x)/((7*x-7)*(3*x-3)) = 0 // * (7*x-7)*(3*x-3)
44-44*x = 0
44-44*x = 0 // - 44
-44*x = -44 // : -44
x = -44/(-44)
x = 1
x in { 1}
x belongs to the empty set
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