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x in (-oo:+oo)
x/6-(2/3) = x/9 // - x/9
x/6-(x/9)-(2/3) = 0
x/6-(x/9)-2/3 = 0
1/18*x-2/3 = 0 // + 2/3
1/18*x = 2/3 // : 1/18
x = 2/3/1/18
x = 12
x = 12
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