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x in (-oo:+oo)
((2/9)*x^1)/3 = -1 // + 1
((2/9)*x^1)/3+1 = 0
((2/9)*x)/3+1 = 0
2/27*x+1 = 0 // - 1
2/27*x = -1 // : 2/27
x = -1/2/27
x = -27/2
x = -27/2
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