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D( x )
16*x = 0
16*x = 0
16*x = 0
16*x = 0 // : 16
x = 0
x in (-oo:0) U (0:+oo)
85 = 200/(16*x) // - 200/(16*x)
85-(200/(16*x)) = 0
(-25/2)*x^-1+85 = 0
-25/2*x^-1 = -85 // : -25/2
x^-1 = 34/5
-1 < 0
1/(x^1) = 34/5 // * x^1
1 = 34/5*x^1 // : 34/5
5/34 = x^1
x = 5/34
x = 5/34
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