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x in (-oo:+oo)
(1/3)*x-(5*x)+2/3 = 86/3 // - 86/3
(1/3)*x-(5*x)+2/3-(86/3) = 0
(1/3)*x-5*x+2/3-86/3 = 0
-14/3*x-28 = 0 // + 28
-14/3*x = 28 // : -14/3
x = 28/(-14/3)
x = -6
x = -6
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