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3.9 = (x^1)/3 // - (x^1)/3
3.9-((x^1)/3) = 0
3.9-(x/3) = 0
3.9-1/3*x = 0 // - 3.9
-1/3*x = -3.9 // : -1/3
x = -3.9/(-1/3)
x = 11.70000012
x = 11.70000012
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