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x in (-oo:+oo)
5*x = 30/13 // - 30/13
5*x-(30/13) = 0
5*x-30/13 = 0
5*x-30/13 = 0 // + 30/13
5*x = 30/13 // : 5
x = 30/13/5
x = 6/13
x = 6/13
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