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X in (-oo:+oo)
((9^6)/7)*X = (12^6)/7 // - (12^6)/7
((9^6)/7)*X-((12^6)/7) = 0
531441/7*X-2985984/7 = 0 // + 2985984/7
531441/7*X = 2985984/7 // : 531441/7
X = 2985984/7/531441/7
X = 4096/729
X = 4096/729
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