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x in (-oo:+oo)
3*x-(2/3) = 12 // - 12
3*x-(2/3)-12 = 0
3*x-2/3-12 = 0
3*x-38/3 = 0 // + 38/3
3*x = 38/3 // : 3
x = 38/3/3
x = 38/9
x = 38/9
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