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x in (-oo:+oo)
(6/7)*x-(6*x)+7 = 73/7 // - 73/7
(6/7)*x-(6*x)-(73/7)+7 = 0
(6/7)*x-6*x-73/7+7 = 0
-36/7*x-24/7 = 0 // + 24/7
-36/7*x = 24/7 // : -36/7
x = 24/7/(-36/7)
x = -2/3
x = -2/3
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