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x in (-oo:+oo)
(5/3)*x+(1/3)*x = (8/3)*x+8/3 // - (8/3)*x+8/3
(5/3)*x+(1/3)*x-((8/3)*x)-(8/3) = 0
(5/3)*x+(1/3)*x+(-8/3)*x-8/3 = 0
-2/3*x-8/3 = 0 // + 8/3
-2/3*x = 8/3 // : -2/3
x = 8/3/(-2/3)
x = -4
x = -4
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