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x in (-oo:+oo)
1/2-2*x = 13/2 // - 13/2
1/2-2*x-(13/2) = 0
1/2-2*x-13/2 = 0
-2*x-6 = 0 // + 6
-2*x = 6 // : -2
x = 6/(-2)
x = -3
x = -3
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