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D( x )
2*x+3 = 0
2*x+3 = 0
2*x+3 = 0
2*x+3 = 0 // - 3
2*x = -3 // : 2
x = -3/2
x in (-oo:-3/2) U (-3/2:+oo)
(x+1)/(2*x+3) = 0.6 // - 0.6
(x+1)/(2*x+3)-0.6 = 0
(x+1)/(2*x+3)+(-0.6*(2*x+3))/(2*x+3) = 0
x-0.6*(2*x+3)+1 = 0
-0.2*x-0.8 = 0
(-0.2*x-0.8)/(2*x+3) = 0
(-0.2*x-0.8)/(2*x+3) = 0 // * 2*x+3
-0.2*x-0.8 = 0
-0.2*x-0.8 = 0 // + 0.8
-0.2*x = 0.8 // : -0.2
x = 0.8/(-0.2)
x = -4
x = -4
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