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x in (-oo:+oo)
1/2-x-(1/9) = x/2 // - x/2
1/2-x-(x/2)-(1/9) = 0
1/2-x-(x/2)-1/9 = 0
7/18-3/2*x = 0 // - 7/18
-3/2*x = -7/18 // : -3/2
x = -7/18/(-3/2)
x = 7/27
x = 7/27
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