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x in (-oo:+oo)
x/12 = 5/13 // - 5/13
x/12-(5/13) = 0
x/12-5/13 = 0
1/12*x-5/13 = 0 // + 5/13
1/12*x = 5/13 // : 1/12
x = 5/13/1/12
x = 60/13
x = 60/13
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