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x in (-oo:+oo)
x/39 = 3/13 // - 3/13
x/39-(3/13) = 0
x/39-3/13 = 0
1/39*x-3/13 = 0 // + 3/13
1/39*x = 3/13 // : 1/39
x = 3/13/1/39
x = 9
x = 9
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