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x in (-oo:+oo)
-((2/3)*x)-8/9 = 1/6 // - 1/6
-((2/3)*x)-8/9-(1/6) = 0
(-2/3)*x-8/9-1/6 = 0
-2/3*x-19/18 = 0 // + 19/18
-2/3*x = 19/18 // : -2/3
x = 19/18/(-2/3)
x = -19/12
x = -19/12
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