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x in (-oo:+oo)
-8 = 4-((4/3)*x) // - 4-((4/3)*x)
(4/3)*x-8-4 = 0
4/3*x-12 = 0 // + 12
4/3*x = 12 // : 4/3
x = 12/4/3
x = 9
x = 9
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