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D( x )
4-(3*x) = 0
4-(3*x) = 0
4-(3*x) = 0
4-3*x = 0
4-3*x = 0 // - 4
-3*x = -4 // : -3
x = -4/(-3)
x = 4/3
x in (-oo:4/3) U (4/3:+oo)
(12*x-7)/(4-(3*x)) = 0
(12*x-7)/(4-3*x) = 0
12*x-7 = 0 // + 7
12*x = 7 // : 12
x = 7/12
x = 7/12
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