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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
y-a-(b/x) = m // - m
y-a-(b/x)-m = 0
-b*x^-1 = -(y-a-m) // : -b
x^-1 = (y-a-m)/b
-1 < 0
1/(x^1) = (y-a-m)/b // * x^1
1 = x^1*((y-a-m)/b) // : (y-a-m)/b
1/((y-a-m)/b) = x^1
x = 1/((y-a-m)/b)
x = 1/((y-a-m)/b)
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