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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4.5/x+98 = 0.9/x+2 // - 0.9/x+2
4.5/x-(0.9/x)-2+98 = 0
4.5/x-0.9*x^-1-2+98 = 0
3.6*x^-1 = -96 // : 3.6
x^-1 = -26.66666667
-1 < 0
1/(x^1) = -26.66666667 // * x^1
1 = -26.66666667*x^1 // : -26.66666667
-0.0375 = x^1
x = -0.0375
x = -0.0375
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