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