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x in (-oo:+oo)
(2*x-4)/9 = -2 // + 2
(2*x-4)/9+2 = 0
(2*x-4)/9+(2*9)/9 = 0
2*x+2*9-4 = 0
2*x+14 = 0
(2*x+14)/9 = 0
(2*x+14)/9 = 0 // * 9
2*x+14 = 0
2*x+14 = 0 // - 14
2*x = -14 // : 2
x = -14/2
x = -7
x = -7
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