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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1-(10.07/x) = 0.3 // - 0.3
1-(10.07/x)-0.3 = 0
1-10.07*x^-1-0.3 = 0
-10.07*x^-1 = -0.7 // : -10.07
x^-1 = 0.06951341
-1 < 0
1/(x^1) = 0.06951341 // * x^1
1 = 0.06951341*x^1 // : 0.06951341
14.38571349 = x^1
x = 14.38571349
x = 14.38571349
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