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D( x )
0.36-x = 0
0.36-x = 0
0.36-x = 0
0.36-x = 0 // - 0.36
-x = -0.36 // * -1
x = 0.36
x in (-oo:0.36) U (0.36:+oo)
1.48*10^-11 = (x^2)/(0.36-x) // - (x^2)/(0.36-x)
1.48*10^-11-((x^2)/(0.36-x)) = 0
(-1*x^2)/(0.36-x)+0 = 0
(-1*x^2)/(0.36-x)+(0*(0.36-x))/(0.36-x) = 0
0*(0.36-x)-1*x^2 = 0
-x^2 = 0
(-x^2)/(0.36-x) = 0
(-x^2)/(0.36-x) = 0 // * 0.36-x
-x^2 = 0
-1*x^2 = 0 // : -1
x^2 = 0
x = 0
x = 0
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