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5/2 = 2*x-4 // - 2*x-4
5/2-(2*x)+4 = 0
5/2-2*x+4 = 0
13/2-2*x = 0 // - 13/2
-2*x = -13/2 // : -2
x = -13/2/(-2)
x = 13/4
x = 13/4
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