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x in (-oo:+oo)
x/13 = 60/39 // - 60/39
x/13-(60/39) = 0
x/13-20/13 = 0
1/13*x-20/13 = 0 // + 20/13
1/13*x = 20/13 // : 1/13
x = 20/13/1/13
x = 20
x = 20
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