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D( x )
x/10000 < 0
x/10000 < 0
x/10000 < 0
1/10000*x+0 < 0 // - 0
1/10000*x < 0 // : 1/10000
x < 0/1/10000
x < 0
x in <0:+oo)
12 = 6*(x/10000)^0.5 // - 6*(x/10000)^0.5
12-(6*(x/10000)^0.5) = 0
12-6*(x/10000)^0.5 = 0
-3/50*x^0.5 = -12 // : -3/50
x^0.5 = 200
( 200 < 0 i 0.5 in (0:1) ) => x naleu017Cy do O
x belongs to the empty set
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