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x in (-oo:+oo)
(2/3)*x = x-(10/3) // - x-(10/3)
(2/3)*x-x+10/3 = 0
10/3-1/3*x = 0 // - 10/3
-1/3*x = -10/3 // : -1/3
x = -10/3/(-1/3)
x = 10
x = 10
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