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D( x )
2*x-4 = 0
2*x-4 = 0
2*x-4 = 0
2*x-4 = 0 // + 4
2*x = 4 // : 2
x = 4/2
x = 2
x in (-oo:2) U (2:+oo)
1/(2*x-4) = 7/3 // - 7/3
1/(2*x-4)-(7/3) = 0
1/(2*x-4)-7/3 = 0
(1*3)/(3*(2*x-4))+(-7*(2*x-4))/(3*(2*x-4)) = 0
1*3-7*(2*x-4) = 0
31-14*x = 0
(31-14*x)/(3*(2*x-4)) = 0
(31-14*x)/(3*(2*x-4)) = 0 // * 3*(2*x-4)
31-14*x = 0
31-14*x = 0 // - 31
-14*x = -31 // : -14
x = -31/(-14)
x = 31/14
x = 31/14
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