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x in (-oo:+oo)
2*x = 4-((1/2)*x) // - 4-((1/2)*x)
2*x+(1/2)*x-4 = 0
5/2*x-4 = 0 // + 4
5/2*x = 4 // : 5/2
x = 4/5/2
x = 8/5
x = 8/5
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