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D( x )
6*x <= 0
6*x <= 0
6*x <= 0
6*x+0 <= 0 // - 0
6*x <= 0 // : 6
x <= 0/6
x <= 0
x in (0:+oo)
log(26)(6*x) > 2/3 // - 2/3
log(26)(6*x)-(2/3) > 0
log(26)(6*x)-2/3 > 0
log(26)(6*x)-2/3 > 0 // + 2/3
log(26)(6*x) > 2/3
log(26)(6*x) in (2/3:+oo)
log(26)(6*x) > log(26)(26^(2/3))
6*x > 26^(2/3)
6*x-26^(2/3) > 0 // + 26^(2/3)
6*x > 26^(2/3) // : 6
x > (26^(2/3))/6
x in ((26^(2/3))/6:+oo)
((26^(2/3))/6:+oo)
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