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x in (-oo:+oo)
(6/7)*x+1 = 6*x-(2/7) // - 6*x-(2/7)
(6/7)*x-(6*x)+2/7+1 = 0
(6/7)*x-6*x+2/7+1 = 0
9/7-36/7*x = 0 // - 9/7
-36/7*x = -9/7 // : -36/7
x = -9/7/(-36/7)
x = 1/4
x = 1/4
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