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x in (-oo:+oo)
3*x-(12/9) = 12 // - 12
3*x-(12/9)-12 = 0
3*x-4/3-12 = 0
3*x-40/3 = 0 // + 40/3
3*x = 40/3 // : 3
x = 40/3/3
x = 40/9
x = 40/9
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