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x in (-oo:+oo)
(1-7*x)/9 = -1 // + 1
(1-7*x)/9+1 = 0
(1-7*x)/9+(1*9)/9 = 0
1*9-7*x+1 = 0
10-7*x = 0
(10-7*x)/9 = 0
(10-7*x)/9 = 0 // * 9
10-7*x = 0
10-7*x = 0 // - 10
-7*x = -10 // : -7
x = -10/(-7)
x = 10/7
x = 10/7
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