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x in (-oo:+oo)
3*x = 1/13 // - 1/13
3*x-(1/13) = 0
3*x-1/13 = 0
3*x-1/13 = 0 // + 1/13
3*x = 1/13 // : 3
x = 1/13/3
x = 1/39
x = 1/39
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