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x in (-oo:+oo)
x/13 = 104/104 // - 104/104
x/13-(104/104) = 0
x/13-1 = 0
1/13*x-1 = 0 // + 1
1/13*x = 1 // : 1/13
x = 1/1/13
x = 13
x = 13
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