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x in (-oo:+oo)
6/7 = 2*x+1/3 // - 2*x+1/3
6/7-(2*x)-(1/3) = 0
6/7-2*x-1/3 = 0
11/21-2*x = 0 // - 11/21
-2*x = -11/21 // : -2
x = -11/21/(-2)
x = 11/42
x = 11/42
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