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x in (-oo:+oo)
5/9 = (-2/3)*x // - (-2/3)*x
5/9-((-2/3)*x) = 0
(2/3)*x+5/9 = 0
2/3*x+5/9 = 0 // - 5/9
2/3*x = -5/9 // : 2/3
x = -5/9/2/3
x = -5/6
x = -5/6
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