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