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x in (-oo:+oo)
13*x = 9/8 // - 9/8
13*x-(9/8) = 0
13*x-9/8 = 0
13*x-9/8 = 0 // + 9/8
13*x = 9/8 // : 13
x = 9/8/13
x = 9/104
x = 9/104
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