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