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x in (-oo:+oo)
18*x-((1/18)*x^18) = 0
(-1/18)*x^18+18*x = 0
18*x-1/18*x^18 = 0
x*(18-1/18*x^17) = 0
-1/18*x^17 = -18 // : -1/18
x^17 = 324
x^17 = 324 // ^ 1/17
x = 324^(1/17)
x = 0
x = 0
x in { 324^(1/17), 0 }
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