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x in (-oo:+oo)
x/13 = 60/65 // - 60/65
x/13-(60/65) = 0
x/13-12/13 = 0
1/13*x-12/13 = 0 // + 12/13
1/13*x = 12/13 // : 1/13
x = 12/13/1/13
x = 12
x = 12
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