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