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