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D( x )
4*x = 0
4*x = 0
4*x = 0
4*x = 0 // : 4
x = 0
x in (-oo:0) U (0:+oo)
(2*x+3)/(4*x) = 6 // - 6
(2*x+3)/(4*x)-6 = 0
(2*x+3)/(4*x)+(-6*4*x)/(4*x) = 0
2*x-6*4*x+3 = 0
3-22*x = 0
(3-22*x)/(4*x) = 0
(3-22*x)/(4*x) = 0 // * 4*x
3-22*x = 0
3-22*x = 0 // - 3
-22*x = -3 // : -22
x = -3/(-22)
x = 3/22
x = 3/22
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