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x in (-oo:+oo)
6-(x/7)-x = 16/21 // - 16/21
6-(x/7)-x-(16/21) = 0
6-(x/7)-x-16/21 = 0
110/21-8/7*x = 0 // - 110/21
-8/7*x = -110/21 // : -8/7
x = -110/21/(-8/7)
x = 55/12
x = 55/12
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