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x in (-oo:+oo)
(1/6)*x-(8/21) = (3/7)*x // - (3/7)*x
(1/6)*x-((3/7)*x)-(8/21) = 0
(1/6)*x+(-3/7)*x-8/21 = 0
-11/42*x-8/21 = 0 // + 8/21
-11/42*x = 8/21 // : -11/42
x = 8/21/(-11/42)
x = -16/11
x = -16/11
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