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