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D( x )
0.35-x = 0
0.35-x = 0
0.35-x = 0
0.35-x = 0 // - 0.35
-x = -0.35 // * -1
x = 0.35
x in (-oo:0.35) U (0.35:+oo)
5.6*10^-10 = (x^2)/(0.35-x) // - (x^2)/(0.35-x)
5.6*10^-10-((x^2)/(0.35-x)) = 0
(-1*x^2)/(0.35-x)+0 = 0
(-1*x^2)/(0.35-x)+(0*(0.35-x))/(0.35-x) = 0
0*(0.35-x)-1*x^2 = 0
-x^2 = 0
(-x^2)/(0.35-x) = 0
(-x^2)/(0.35-x) = 0 // * 0.35-x
-x^2 = 0
-1*x^2 = 0 // : -1
x^2 = 0
x = 0
x = 0
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