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x in (-oo:+oo)
x/90 = (x^8)/9-((5*x)/6) // - (x^8)/9-((5*x)/6)
x/90-((x^8)/9)+(5*x)/6 = 0
38/45*x-1/9*x^8 = 0
1/9*x*(38/5-x^7) = 0
-1*x^7 = -38/5 // : -1
x^7 = 38/5
x^7 = 38/5 // ^ 1/7
x = (38/5)^(1/7)
x/9 = 0
1/9*x = 0 // : 1/9
x = 0
x in { (38/5)^(1/7), 0 }
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