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x in (-oo:+oo)
2/2.91 = x/3 // - x/3
2/2.91-(x/3) = 0
0.68728522-1/3*x = 0 // - 0.68728522
-1/3*x = -0.68728522 // : -1/3
x = -0.68728522/(-1/3)
x = 2.06185568
x = 2.06185568
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