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x in (-oo:+oo)
(7*x)/9-12 = x // - x
(7*x)/9-x-12 = 0
-2/9*x-12 = 0 // + 12
-2/9*x = 12 // : -2/9
x = 12/(-2/9)
x = -54
x = -54
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