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x in (-oo:+oo)
1/2 = x/9 // - x/9
1/2-(x/9) = 0
1/2-1/9*x = 0 // - 1/2
-1/9*x = -1/2 // : -1/9
x = -1/2/(-1/9)
x = 9/2
x = 9/2
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