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