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x in (-oo:+oo)
5*x-(9/2) = 8 // - 8
5*x-(9/2)-8 = 0
5*x-9/2-8 = 0
5*x-25/2 = 0 // + 25/2
5*x = 25/2 // : 5
x = 25/2/5
x = 5/2
x = 5/2
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