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D( x )
3*x = 0
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
x in (-oo:0) U (0:+oo)
(x-132)/(3*x) = 0
x-132 = 0 // + 132
x = 132
x = 132
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