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