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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7000/x = 5.5 // - 5.5
7000/x-5.5 = 0
7000*x^-1 = 5.5 // : 7000
x^-1 = 0.00078571
-1 < 0
1/(x^1) = 0.00078571 // * x^1
1 = 0.00078571*x^1 // : 0.00078571
1272.73421491 = x^1
x = 1272.73421491
x = 1272.73421491
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