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D( x )
7*(3*x-2) = 0
7*(3*x-2) = 0
7*(3*x-2) = 0
( 3*x-2 )
3*x-2 = 0 // + 2
3*x = 2 // : 3
x = 2/3
( 7 )
7 = 0
x belongs to the empty set
x in (-oo:2/3) U (2/3:+oo)
2/(7*(3*x-2)) = 56 // - 56
2/(7*(3*x-2))-56 = 0
2/(7*(3*x-2))+(-56*7*(3*x-2))/(7*(3*x-2)) = 0
2-56*7*(3*x-2) = 0
786-1176*x = 0
(786-1176*x)/(7*(3*x-2)) = 0
(786-1176*x)/(7*(3*x-2)) = 0 // * 7*(3*x-2)
786-1176*x = 0
786-1176*x = 0 // - 786
-1176*x = -786 // : -1176
x = -786/(-1176)
x = 131/196
x = 131/196
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