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