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