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