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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
70 = 4375/x // - 4375/x
70-(4375/x) = 0
70-4375*x^-1 = 0
-4375*x^-1 = -70 // : -4375
x^-1 = 2/125
-1 < 0
1/(x^1) = 2/125 // * x^1
1 = 2/125*x^1 // : 2/125
125/2 = x^1
x = 125/2
x = 125/2
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