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x in (-oo:+oo)
(18*x-9)/9-2 = 11 // - 11
(18*x-9)/9-11-2 = 0
(18*x-9)/9+(-11*9)/9+(-2*9)/9 = 0
18*x-11*9-2*9-9 = 0
18*x-108-18 = 0
18*x-126 = 0
(18*x-126)/9 = 0
(18*x-126)/9 = 0 // * 9
18*x-126 = 0
18*x-126 = 0 // + 126
18*x = 126 // : 18
x = 126/18
x = 7
x = 7
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