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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
105/x = 70 // - 70
105/x-70 = 0
105*x^-1 = 70 // : 105
x^-1 = 2/3
-1 < 0
1/(x^1) = 2/3 // * x^1
1 = 2/3*x^1 // : 2/3
3/2 = x^1
x = 3/2
x = 3/2
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