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