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x in (-oo:+oo)
x/13 = 12/72 // - 12/72
x/13-(12/72) = 0
x/13-1/6 = 0
1/13*x-1/6 = 0 // + 1/6
1/13*x = 1/6 // : 1/13
x = 1/6/1/13
x = 13/6
x = 13/6
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