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x in (-oo:+oo)
x/6 = 13/7 // - 13/7
x/6-(13/7) = 0
x/6-13/7 = 0
1/6*x-13/7 = 0 // + 13/7
1/6*x = 13/7 // : 1/6
x = 13/7/1/6
x = 78/7
x = 78/7
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