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x in (-oo:+oo)
(3/13)*x = 9/26 // - 9/26
(3/13)*x-(9/26) = 0
(3/13)*x-9/26 = 0
3/13*x-9/26 = 0 // + 9/26
3/13*x = 9/26 // : 3/13
x = 9/26/3/13
x = 3/2
x = 3/2
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