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