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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1-(x/x) = 3*(4-(2*x)) // - 3*(4-(2*x))
1-(3*(4-(2*x)))-(x/x) = 0
1-3*(4-2*x)-1 = 0
1-3*(4-2*x)-1 = 0
6*x-13+1 = 0
6*x-12 = 0
6*x-12 = 0
6*x-12 = 0 // + 12
6*x = 12 // : 6
x = 12/6
x = 2
x = 2
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