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x in (-oo:+oo)
x/6 = 12/8 // - 12/8
x/6-(12/8) = 0
x/6-3/2 = 0
1/6*x-3/2 = 0 // + 3/2
1/6*x = 3/2 // : 1/6
x = 3/2/1/6
x = 9
x = 9
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