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x in (-oo:+oo)
-12 = 8-((4/3)*x) // - 8-((4/3)*x)
(4/3)*x-12-8 = 0
4/3*x-20 = 0 // + 20
4/3*x = 20 // : 4/3
x = 20/4/3
x = 15
x = 15
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