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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)
(27*x^2+64)/(3*x+4) = 0
27*x^2 = -64 // : 27
x^2 = -64/27
x belongs to the empty set
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