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