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x in (-oo:+oo)
3*x-(12/9) = x // - x
3*x-x-(12/9) = 0
3*x-x-4/3 = 0
2*x-4/3 = 0 // + 4/3
2*x = 4/3 // : 2
x = 4/3/2
x = 2/3
x = 2/3
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