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x in (-oo:+oo)
x/6-(x/7) = 5/6 // - 5/6
x/6-(x/7)-(5/6) = 0
x/6-(x/7)-5/6 = 0
1/42*x-5/6 = 0 // + 5/6
1/42*x = 5/6 // : 1/42
x = 5/6/1/42
x = 35
x = 35
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