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x in (-oo:+oo)
12 = (-8/9)*x // - (-8/9)*x
12-((-8/9)*x) = 0
(8/9)*x+12 = 0
8/9*x+12 = 0 // - 12
8/9*x = -12 // : 8/9
x = -12/8/9
x = -27/2
x = -27/2
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