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x in (-oo:+oo)
1/2-2*x = 7/2 // - 7/2
1/2-2*x-(7/2) = 0
1/2-2*x-7/2 = 0
-2*x-3 = 0 // + 3
-2*x = 3 // : -2
x = 3/(-2)
x = -3/2
x = -3/2
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