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D( x )
x = 0
x^2 = 0
x = 0
x = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x-((3*x)/(x^2))-225-16 = 4/x+15 // - 4/x+15
2/x-((3*x)/(x^2))-(4/x)-225-16-15 = 0
2/x-3*x^-1-4*x^-1-225-16-15 = 0
-5*x^-1 = 256 // : -5
x^-1 = -256/5
-1 < 0
1/(x^1) = -256/5 // * x^1
1 = -256/5*x^1 // : -256/5
-5/256 = x^1
x = -5/256
x = -5/256
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