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