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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3400/x = 100/350 // - 100/350
3400/x-(100/350) = 0
3400/x-2/7 = 0
3400*x^-1 = 2/7 // : 3400
x^-1 = 1/11900
-1 < 0
1/(x^1) = 1/11900 // * x^1
1 = 1/11900*x^1 // : 1/11900
11900 = x^1
x = 11900
x = 11900
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