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x in (-oo:+oo)
(3/7)*x-x = -6 // + 6
(3/7)*x-x+6 = 0
6-4/7*x = 0 // - 6
-4/7*x = -6 // : -4/7
x = -6/(-4/7)
x = 21/2
x = 21/2
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