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D( x )
3*x-(3/2) = 0
3*x-(3/2) = 0
3*x-(3/2) = 0
3*x-3/2 = 0
3*x-3/2 = 0 // + 3/2
3*x = 3/2 // : 3
x = 3/2/3
x = 1/2
x in (-oo:1/2) U (1/2:+oo)
(7*x-(7/3))/(3*x-(3/2)) = 0
(7*x-7/3)/(3*x-3/2) = 0
7*x-7/3 = 0 // + 7/3
7*x = 7/3 // : 7
x = 7/3/7
x = 1/3
x = 1/3
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