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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2*y-z)/x = 12 // - 12
(2*y-z)/x-12 = 0
(2*y-z)/x+(-12*x)/x = 0
2*y-12*x-z = 0
(2*y-12*x-z)/x = 0
(2*y-12*x-z)/x = 0 // * x
2*y-12*x-z = 0
2*y-12*x-z = 0 // - 2*y-z
-12*x = -(2*y-z) // : -12
x = (-(2*y-z))/(-12)
x = (z-(2*y))/(-12)
x = (z-(2*y))/(-12)
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