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D( x )
3*x+1 = 0
3*x+1 = 0
3*x+1 = 0
3*x+1 = 0 // - 1
3*x = -1 // : 3
x = -1/3
x in (-oo:-1/3) U (-1/3:+oo)
(3*x-4)/(3*x+1) = 4/5 // - 4/5
(3*x-4)/(3*x+1)-(4/5) = 0
(3*x-4)/(3*x+1)-4/5 = 0
(5*(3*x-4))/(5*(3*x+1))+(-4*(3*x+1))/(5*(3*x+1)) = 0
5*(3*x-4)-4*(3*x+1) = 0
3*x-24 = 0
(3*x-24)/(5*(3*x+1)) = 0
(3*x-24)/(5*(3*x+1)) = 0 // * 5*(3*x+1)
3*x-24 = 0
3*x-24 = 0 // + 24
3*x = 24 // : 3
x = 24/3
x = 8
x = 8
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