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x in (-oo:+oo)
(2*x)/9-6 = x // - x
(2*x)/9-x-6 = 0
-7/9*x-6 = 0 // + 6
-7/9*x = 6 // : -7/9
x = 6/(-7/9)
x = -54/7
x = -54/7
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