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x in (-oo:+oo)
(6/7)*x-x+1 = 6/7 // - 6/7
(6/7)*x-x-(6/7)+1 = 0
(6/7)*x-x-6/7+1 = 0
1/7-1/7*x = 0 // - 1/7
-1/7*x = -1/7 // : -1/7
x = -1/7/(-1/7)
x = 1
x = 1
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