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x in (-oo:+oo)
2.5/6 = x/9 // - x/9
2.5/6-(x/9) = 0
0.41666667-1/9*x = 0 // - 0.41666667
-1/9*x = -0.41666667 // : -1/9
x = -0.41666667/(-1/9)
x = 3.75000007
x = 3.75000007
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