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x in (-oo:+oo)
x/6-(x/7) = 5/7 // - 5/7
x/6-(x/7)-(5/7) = 0
x/6-(x/7)-5/7 = 0
1/42*x-5/7 = 0 // + 5/7
1/42*x = 5/7 // : 1/42
x = 5/7/1/42
x = 30
x = 30
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