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x in (-oo:+oo)
((2/3)/3)/4 = (x/1)/5 // - (x/1)/5
((2/3)/3)/4-((x/1)/5) = 0
((2/3)/3)/4-(x/5) = 0
1/18-1/5*x = 0 // - 1/18
-1/5*x = -1/18 // : -1/5
x = -1/18/(-1/5)
x = 5/18
x = 5/18
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