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5*x-((20/9)*x^18) = 0
(-20/9)*x^18+5*x = 0
5*x-20/9*x^18 = 0
5*x*(1-4/9*x^17) = 0
-4/9*x^17 = -1 // : -4/9
x^17 = 9/4
x^17 = 9/4 // ^ 1/17
x = (9/4)^(1/17)
5*x = 0
5*x = 0 // : 5
x = 0
x in { (9/4)^(1/17), 0 }
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