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D( x )
3*x-7 = 0
3*x-7 = 0
3*x-7 = 0
3*x-7 = 0 // + 7
3*x = 7 // : 3
x = 7/3
x in (-oo:7/3) U (7/3:+oo)
(4*x-5)/(3*x-7) = 4 // - 4
(4*x-5)/(3*x-7)-4 = 0
(4*x-5)/(3*x-7)+(-4*(3*x-7))/(3*x-7) = 0
4*x-4*(3*x-7)-5 = 0
23-8*x = 0
(23-8*x)/(3*x-7) = 0
(23-8*x)/(3*x-7) = 0 // * 3*x-7
23-8*x = 0
23-8*x = 0 // - 23
-8*x = -23 // : -8
x = -23/(-8)
x = 23/8
x = 23/8
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