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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1-(100/x) = 0.75 // - 0.75
1-(100/x)-0.75 = 0
1-100*x^-1-0.75 = 0
-100*x^-1 = -0.25 // : -100
x^-1 = 0.0025
-1 < 0
1/(x^1) = 0.0025 // * x^1
1 = 0.0025*x^1 // : 0.0025
400 = x^1
x = 400
x = 400
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