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x in (-oo:+oo)
3*x = 13/3 // - 13/3
3*x-(13/3) = 0
3*x-13/3 = 0
3*x-13/3 = 0 // + 13/3
3*x = 13/3 // : 3
x = 13/3/3
x = 13/9
x = 13/9
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