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x in (-oo:+oo)
8-x = (-2/6)*x+28/6 // - (-2/6)*x+28/6
8-x-((-2/6)*x)-(28/6) = 0
(1/3)*x-x-14/3+8 = 0
10/3-2/3*x = 0 // - 10/3
-2/3*x = -10/3 // : -2/3
x = -10/3/(-2/3)
x = 5
x = 5
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