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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)
x/(2*x+1) = 4/3 // - 4/3
x/(2*x+1)-(4/3) = 0
x/(2*x+1)-4/3 = 0
(3*x)/(3*(2*x+1))+(-4*(2*x+1))/(3*(2*x+1)) = 0
3*x-4*(2*x+1) = 0
-5*x-4 = 0
(-5*x-4)/(3*(2*x+1)) = 0
(-5*x-4)/(3*(2*x+1)) = 0 // * 3*(2*x+1)
-5*x-4 = 0
-5*x-4 = 0 // + 4
-5*x = 4 // : -5
x = 4/(-5)
x = -4/5
x = -4/5
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