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