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x in (-oo:+oo)
x/39 = 4/13 // - 4/13
x/39-(4/13) = 0
x/39-4/13 = 0
1/39*x-4/13 = 0 // + 4/13
1/39*x = 4/13 // : 1/39
x = 4/13/1/39
x = 12
x = 12
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