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x in (-oo:+oo)
(10/13)*x = 30/39 // - 30/39
(10/13)*x-(30/39) = 0
(10/13)*x-10/13 = 0
10/13*x-10/13 = 0 // + 10/13
10/13*x = 10/13 // : 10/13
x = 10/13/10/13
x = 1
x = 1
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