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x in (-oo:+oo)
(2/3)*x-x+1 = 8/3 // - 8/3
(2/3)*x-x-(8/3)+1 = 0
(2/3)*x-x-8/3+1 = 0
-1/3*x-5/3 = 0 // + 5/3
-1/3*x = 5/3 // : -1/3
x = 5/3/(-1/3)
x = -5
x = -5
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