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D( x )
4*x+1 = 0
4*x+1 = 0
4*x+1 = 0
4*x+1 = 0 // - 1
4*x = -1 // : 4
x = -1/4
x in (-oo:-1/4) U (-1/4:+oo)
1/(4*x+1)+1*(3*x-1) = 4 // - 4
1/(4*x+1)+1*(3*x-1)-4 = 0
1/(4*x+1)+3*x-4-1 = 0
1/(4*x+1)+(3*x*(4*x+1))/(4*x+1)+(-4*(4*x+1))/(4*x+1)+(-1*(4*x+1))/(4*x+1) = 0
3*x*(4*x+1)-4*(4*x+1)-1*(4*x+1)+1 = 0
12*x^2+3*x-16*x-4*x-4-1+1 = 0
12*x^2-13*x-4*x-3-1 = 0
12*x^2-17*x-4 = 0
12*x^2-17*x-4 = 0
12*x^2-17*x-4 = 0
DELTA = (-17)^2-(-4*4*12)
DELTA = 481
DELTA > 0
x = (481^(1/2)+17)/(2*12) or x = (17-481^(1/2))/(2*12)
x = (481^(1/2)+17)/24 or x = (17-481^(1/2))/24
(x-((17-481^(1/2))/24))*(x-((481^(1/2)+17)/24)) = 0
((x-((17-481^(1/2))/24))*(x-((481^(1/2)+17)/24)))/(4*x+1) = 0
((x-((17-481^(1/2))/24))*(x-((481^(1/2)+17)/24)))/(4*x+1) = 0 // * 4*x+1
(x-((17-481^(1/2))/24))*(x-((481^(1/2)+17)/24)) = 0
( x-((17-481^(1/2))/24) )
x-((17-481^(1/2))/24) = 0 // + (17-481^(1/2))/24
x = (17-481^(1/2))/24
( x-((481^(1/2)+17)/24) )
x-((481^(1/2)+17)/24) = 0 // + (481^(1/2)+17)/24
x = (481^(1/2)+17)/24
x in { (17-481^(1/2))/24, (481^(1/2)+17)/24 }
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