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x in (-oo:+oo)
(1/2)*x-2 = 2-((9/2)*x) // - 2-((9/2)*x)
(1/2)*x+(9/2)*x-2-2 = 0
5*x-4 = 0 // + 4
5*x = 4 // : 5
x = 4/5
x = 4/5
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