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