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x in (-oo:+oo)
(1/3)*x = -2/3 // + -2/3
(1/3)*x-(-2/3) = 0
(1/3)*x+2/3 = 0
1/3*x+2/3 = 0 // - 2/3
1/3*x = -2/3 // : 1/3
x = -2/3/1/3
x = -2
x = -2
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