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