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x in (-oo:+oo)
6/128 = x/12 // - x/12
6/128-(x/12) = 0
3/64-1/12*x = 0 // - 3/64
-1/12*x = -3/64 // : -1/12
x = -3/64/(-1/12)
x = 9/16
x = 9/16
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