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