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x in (-oo:+oo)
2/3-(x/6) = 1 // - 1
2/3-(x/6)-1 = 0
-1/6*x-1/3 = 0 // + 1/3
-1/6*x = 1/3 // : -1/6
x = 1/3/(-1/6)
x = -2
x = -2
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