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x in (-oo:+oo)
x/6-(x/7) = 8/7 // - 8/7
x/6-(x/7)-(8/7) = 0
x/6-(x/7)-8/7 = 0
1/42*x-8/7 = 0 // + 8/7
1/42*x = 8/7 // : 1/42
x = 8/7/1/42
x = 48
x = 48
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