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x in (-oo:+oo)
6/12 = x/18 // - x/18
6/12-(x/18) = 0
1/2-1/18*x = 0 // - 1/2
-1/18*x = -1/2 // : -1/18
x = -1/2/(-1/18)
x = 9
x = 9
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