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x in (-oo:+oo)
2*x = 20/13 // - 20/13
2*x-(20/13) = 0
2*x-20/13 = 0
2*x-20/13 = 0 // + 20/13
2*x = 20/13 // : 2
x = 20/13/2
x = 10/13
x = 10/13
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