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x in (-oo:+oo)
5/2-(2*x) = 6/4 // - 6/4
5/2-(2*x)-(6/4) = 0
5/2-2*x-3/2 = 0
1-2*x = 0 // - 1
-2*x = -1 // : -2
x = -1/(-2)
x = 1/2
x = 1/2
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