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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
y/x+22 = z/t // - z/t
y/x-(z/t)+22 = 0
x^-1*y = -(22-(t^-1*z)) // : y
x^-1 = (t^-1*z-22)/y
-1 < 0
1/(x^1) = (t^-1*z-22)/y // * x^1
1 = x^1*((t^-1*z-22)/y) // : (t^-1*z-22)/y
1/((t^-1*z-22)/y) = x^1
x = 1/((t^-1*z-22)/y)
x = 1/((t^-1*z-22)/y)
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