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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2*(x-4)*(340/x-4) = 0
2*(x-4)*(340*x^-1-4) = 0
( 340*x^-1-4 )
340*x^-1 = 4 // : 340
x^-1 = 1/85
-1 < 0
1/(x^1) = 1/85 // * x^1
1 = 1/85*x^1 // : 1/85
85 = x^1
x = 85
( x-4 )
x-4 = 0 // + 4
x = 4
x in { 85, 4 }
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