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D( x )
4*x-1 = 0
x+2 = 0
4*x-1 = 0
4*x-1 = 0
4*x-1 = 0 // + 1
4*x = 1 // : 4
x = 1/4
x+2 = 0
x+2 = 0
x+2 = 0 // - 2
x = -2
x in (-oo:-2) U (-2:1/4) U (1/4:+oo)
3/(x+2) = 9/(4*x-1) // - 9/(4*x-1)
3/(x+2)-(9/(4*x-1)) = 0
3/(x+2)-9*(4*x-1)^-1 = 0
3/(x+2)-9/(4*x-1) = 0
(3*(4*x-1))/((x+2)*(4*x-1))+(-9*(x+2))/((x+2)*(4*x-1)) = 0
3*(4*x-1)-9*(x+2) = 0
3*x-21 = 0
(3*x-21)/((x+2)*(4*x-1)) = 0
(3*x-21)/((x+2)*(4*x-1)) = 0 // * (x+2)*(4*x-1)
3*x-21 = 0
3*x-21 = 0 // + 21
3*x = 21 // : 3
x = 21/3
x = 7
x = 7
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