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x in (-oo:+oo)
(1/3)*x-1 = (7/3)*x // - (7/3)*x
(1/3)*x-((7/3)*x)-1 = 0
(1/3)*x+(-7/3)*x-1 = 0
-2*x-1 = 0 // + 1
-2*x = 1 // : -2
x = 1/(-2)
x = -1/2
x = -1/2
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