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x in (-oo:+oo)
(-2/3)*x = 8/9 // - 8/9
(-2/3)*x-(8/9) = 0
(-2/3)*x-8/9 = 0
-2/3*x-8/9 = 0 // + 8/9
-2/3*x = 8/9 // : -2/3
x = 8/9/(-2/3)
x = -4/3
x = -4/3
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