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x in (-oo:+oo)
1/2-(x/9) = 2*x-(9/9) // - 2*x-(9/9)
1/2-(x/9)-(2*x)+9/9 = 0
1/2-(x/9)-2*x+9/9 = 0
3/2-19/9*x = 0 // - 3/2
-19/9*x = -3/2 // : -19/9
x = -3/2/(-19/9)
x = 27/38
x = 27/38
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