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x in (-oo:+oo)
(1/2)*x = 5/13 // - 5/13
(1/2)*x-(5/13) = 0
(1/2)*x-5/13 = 0
1/2*x-5/13 = 0 // + 5/13
1/2*x = 5/13 // : 1/2
x = 5/13/1/2
x = 10/13
x = 10/13
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