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