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x in (-oo:+oo)
(x+3)/9 = 14 // - 14
(x+3)/9-14 = 0
(x+3)/9+(-14*9)/9 = 0
x-14*9+3 = 0
x-123 = 0
(x-123)/9 = 0
(x-123)/9 = 0 // * 9
x-123 = 0
x-123 = 0 // + 123
x = 123
x = 123
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