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x in (-oo:+oo)
x/6-(x/7) = 9/7 // - 9/7
x/6-(x/7)-(9/7) = 0
x/6-(x/7)-9/7 = 0
1/42*x-9/7 = 0 // + 9/7
1/42*x = 9/7 // : 1/42
x = 9/7/1/42
x = 54
x = 54
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