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