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