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x in (-oo:+oo)
(2/7)*(x-6) = (3/7)*(3*x-1)-x // - (3/7)*(3*x-1)-x
(2/7)*(x-6)-((3/7)*(3*x-1))+x = 0
(2/7)*(x-6)+(-3/7)*(3*x-1)+x = 0
2/7*(x-6)-3/7*(3*x-1)+x = 0
2/7*(x-6)-3/7*(3*x-1)+x = 0
x-x-9/7 = 0
-9/7 = 0
-9/7 = 0
-9/7 = 0 // * 7
-9 = 0
-9 = 0
x belongs to the empty set
x belongs to the empty set
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