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x in (-oo:+oo)
5-2*x = 11/2 // - 11/2
5-2*x-(11/2) = 0
5-2*x-11/2 = 0
-2*x-1/2 = 0 // + 1/2
-2*x = 1/2 // : -2
x = 1/2/(-2)
x = -1/4
x = -1/4
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