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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
c*((w*z)/b) = (a*d)/x // - (a*d)/x
c*((w*z)/b)-((a*d)/x) = 0
-a*(-d)*x^-1 = -(b^-1*c*w*z) // : -(a*d)
x^-1 = (b^-1*c*w*z)/(a*d)
-1 < 0
1/(x^1) = (b^-1*c*w*z)/(a*d) // * x^1
1 = ((b^-1*c*w*z)/(a*d))*x^1 // : (b^-1*c*w*z)/(a*d)
1/((b^-1*c*w*z)/(a*d)) = x^1
x = 1/((b^-1*c*w*z)/(a*d))
x = 1/((b^-1*c*w*z)/(a*d))
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