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D( x )
4*x = 0
x+1 = 0
4*x = 0
4*x = 0
4*x = 0 // : 4
x = 0
x+1 = 0
x+1 = 0
x+1 = 0 // - 1
x = -1
x in (-oo:-1) U (-1:0) U (0:+oo)
2/(x+1)+3/(4*x) = 0
(2*4*x)/(4*x*(x+1))+(3*(x+1))/(4*x*(x+1)) = 0
3*(x+1)+2*4*x = 0
11*x+3 = 0
(11*x+3)/(4*x*(x+1)) = 0
(11*x+3)/(4*x*(x+1)) = 0 // * 4*x*(x+1)
11*x+3 = 0
11*x+3 = 0 // - 3
11*x = -3 // : 11
x = -3/11
x = -3/11
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