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x in (-oo:+oo)
x/39 = 6/13 // - 6/13
x/39-(6/13) = 0
x/39-6/13 = 0
1/39*x-6/13 = 0 // + 6/13
1/39*x = 6/13 // : 1/39
x = 6/13/1/39
x = 18
x = 18
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