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