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x in (-oo:+oo)
8/12 = x/3 // - x/3
8/12-(x/3) = 0
2/3-1/3*x = 0 // - 2/3
-1/3*x = -2/3 // : -1/3
x = -2/3/(-1/3)
x = 2
x = 2
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