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x in (-oo:+oo)
3*x = 56/21 // - 56/21
3*x-(56/21) = 0
3*x-8/3 = 0
3*x-8/3 = 0 // + 8/3
3*x = 8/3 // : 3
x = 8/3/3
x = 8/9
x = 8/9
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