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D( x )
6*(1/2)*x = 0
6*(1/2)*x = 0
6*(1/2)*x = 0
3*x = 0 // : 3
x = 0
x in (-oo:0) U (0:+oo)
(5*(1/3)*x)/(6*(1/2)*x) = 5/9 // - 5/9
(5*(1/3)*x)/(6*(1/2)*x)-(5/9) = 0
(5*(1/3)*x)/(6*(1/2)*x)-5/9 = 0
0 = 0
x należy do R
x in (-oo:0) U (0:+oo)
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