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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x-7 = y // - y
4/x-y-7 = 0
4*x^-1 = -(-y-7) // : 4
x^-1 = (y+7)/4
-1 < 0
1/(x^1) = (y+7)/4 // * x^1
1 = x^1*((y+7)/4) // : (y+7)/4
4*(y+7)^-1 = x^1
x = 4*(y+7)^-1
x = 4*(y+7)^-1
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